Branded stable channel builds should not display any text after the version number in the About window or about:version.
Branded stable channel builds should not display any text after the version
number in the About window or about:version.

The existing code assumed that KSChannelID would be set to "stable" on the
stable channel, but this is incorrect. On the stable channel, KSChannelID is
not set at all.

Originally, the code was correct, but it broke in r36375.

BUG=43357
TEST=1. Check the About window in a stable-channel build. It should show the
        version number without being adorned by the word "unknown" or any
        other text.
     2. In the same stable-channel builds, visit about:version. The Google
        Chrome line should show something like 5.0.375.29 (Official Build
        46008) without the word "unknown" or any other text.
Review URL: http://codereview.chromium.org/1990002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@46541 0039d316-1c4b-4281-b951-d872f2087c98

dushu1203/chromium.src,keishi/chromium,Chilledheart/chromium,fujunwei/chromium-crosswalk,chuan9/chromium-crosswalk,rogerwang/chromium,nacl-webkit/chrome_deps,mohamed--abdel-maksoud/chromium.src,Fireblend/chromium-crosswalk,pozdnyakov/chromium-crosswalk,bright-sparks/chromium-spacewalk,ltilve/chromium,junmin-zhu/chromium-rivertrail,mohamed--abdel-maksoud/chromium.src,markYoungH/chromium.src,ChromiumWebApps/chromium,fujunwei/chromium-crosswalk,anirudhSK/chromium,mogoweb/chromium-crosswalk,timopulkkinen/BubbleFish,M4sse/chromium.src,junmin-zhu/chromium-rivertrail,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,nacl-webkit/chrome_deps,crosswalk-project/chromium-crosswalk-efl,TheTypoMaster/chromium-crosswalk,axinging/chromium-crosswalk,ondra-novak/chromium.src,nacl-webkit/chrome_deps,mogoweb/chromium-crosswalk,M4sse/chromium.src,mogoweb/chromium-crosswalk,dushu1203/chromium.src,patrickm/chromium.src,Fireblend/chromium-crosswalk,nacl-webkit/chrome_deps,keishi/chromium,ltilve/chromium,mohamed--abdel-maksoud/chromium.src,ltilve/chromium,anirudhSK/chromium,pozdnyakov/chromium-crosswalk,bright-sparks/chromium-spacewalk,hgl888/chromium-crosswalk,patrickm/chromium.src,Chilledheart/chromium,dushu1203/chromium.src,rogerwang/chromium,fujunwei/chromium-crosswalk,dednal/chromium.src,mogoweb/chromium-crosswalk,jaruba/chromium.src,pozdnyakov/chromium-crosswalk,zcbenz/cefode-chromium,nacl-webkit/chrome_deps,axinging/chromium-crosswalk,robclark/chromium,pozdnyakov/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,ChromiumWebApps/chromium,dednal/chromium.src,mogoweb/chromium-crosswalk,nacl-webkit/chrome_deps,axinging/chromium-crosswalk,Jonekee/chromium.src,axinging/chromium-crosswalk,axinging/chromium-crosswalk,chuan9/chromium-crosswalk,Just-D/chromium-1,dushu1203/chromium.src,junmin-zhu/chromium-rivertrail,dednal/chromium.src,hgl888/chromium-crosswalk,anirudhSK/chromium,nacl-webkit/chrome_deps,PeterWangIntel/chromium-crosswalk,Jonekee/chromium.src,markYoungH/chromium.src,axinging/chromium-crosswalk,timopulkkinen/BubbleFish,hgl888/chromium-crosswalk-efl,anirudhSK/chromium,zcbenz/cefode-chromium,hujiajie/pa-chromium,littlstar/chromium.src,hgl888/chromium-crosswalk,ChromiumWebApps/chromium,Just-D/chromium-1,hujiajie/pa-chromium,dednal/chromium.src,fujunwei/chromium-crosswalk,Just-D/chromium-1,Just-D/chromium-1,dednal/chromium.src,keishi/chromium,bright-sparks/chromium-spacewalk,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,hujiajie/pa-chromium,M4sse/chromium.src,Pluto-tv/chromium-crosswalk,hujiajie/pa-chromium,timopulkkinen/BubbleFish,bright-sparks/chromium-spacewalk,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,jaruba/chromium.src,timopulkkinen/BubbleFish,ChromiumWebApps/chromium,ltilve/chromium,nacl-webkit/chrome_deps,TheTypoMaster/chromium-crosswalk,M4sse/chromium.src,Fireblend/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,pozdnyakov/chromium-crosswalk,rogerwang/chromium,dushu1203/chromium.src,dednal/chromium.src,robclark/chromium,ChromiumWebApps/chromium,Just-D/chromium-1,jaruba/chromium.src,robclark/chromium,Just-D/chromium-1,PeterWangIntel/chromium-crosswalk,robclark/chromium,Pluto-tv/chromium-crosswalk,zcbenz/cefode-chromium,dednal/chromium.src,Jonekee/chromium.src,ChromiumWebApps/chromium,Jonekee/chromium.src,krieger-od/nwjs_chromium.src,crosswalk-project/chromium-crosswalk-efl,hgl888/chromium-crosswalk-efl,ChromiumWebApps/chromium,mohamed--abdel-maksoud/chromium.src,junmin-zhu/chromium-rivertrail,krieger-od/nwjs_chromium.src,anirudhSK/chromium,hujiajie/pa-chromium,crosswalk-project/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,ondra-novak/chromium.src,pozdnyakov/chromium-crosswalk,Chilledheart/chromium,hgl888/chromium-crosswalk,hgl888/chromium-crosswalk,M4sse/chromium.src,patrickm/chromium.src,keishi/chromium,hujiajie/pa-chromium,rogerwang/chromium,robclark/chromium,timopulkkinen/BubbleFish,fujunwei/chromium-crosswalk,robclark/chromium,rogerwang/chromium,mogoweb/chromium-crosswalk,patrickm/chromium.src,junmin-zhu/chromium-rivertrail,patrickm/chromium.src,patrickm/chromium.src,dednal/chromium.src,Jonekee/chromium.src,mogoweb/chromium-crosswalk,junmin-zhu/chromium-rivertrail,hujiajie/pa-chromium,ltilve/chromium,jaruba/chromium.src,rogerwang/chromium,PeterWangIntel/chromium-crosswalk,patrickm/chromium.src,Fireblend/chromium-crosswalk,ChromiumWebApps/chromium,hgl888/chromium-crosswalk-efl,anirudhSK/chromium,bright-sparks/chromium-spacewalk,krieger-od/nwjs_chromium.src,Jonekee/chromium.src,M4sse/chromium.src,krieger-od/nwjs_chromium.src,robclark/chromium,rogerwang/chromium,junmin-zhu/chromium-rivertrail,krieger-od/nwjs_chromium.src,zcbenz/cefode-chromium,PeterWangIntel/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,anirudhSK/chromium,zcbenz/cefode-chromium,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk,dednal/chromium.src,anirudhSK/chromium,markYoungH/chromium.src,pozdnyakov/chromium-crosswalk,jaruba/chromium.src,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,ondra-novak/chromium.src,markYoungH/chromium.src,keishi/chromium,junmin-zhu/chromium-rivertrail,patrickm/chromium.src,Pluto-tv/chromium-crosswalk,timopulkkinen/BubbleFish,mohamed--abdel-maksoud/chromium.src,bright-sparks/chromium-spacewalk,littlstar/chromium.src,mohamed--abdel-maksoud/chromium.src,hujiajie/pa-chromium,bright-sparks/chromium-spacewalk,markYoungH/chromium.src,nacl-webkit/chrome_deps,TheTypoMaster/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,mohamed--abdel-maksoud/chromium.src,mogoweb/chromium-crosswalk,littlstar/chromium.src,axinging/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,dushu1203/chromium.src,keishi/chromium,TheTypoMaster/chromium-crosswalk,zcbenz/cefode-chromium,timopulkkinen/BubbleFish,Chilledheart/chromium,Chilledheart/chromium,timopulkkinen/BubbleFish,jaruba/chromium.src,jaruba/chromium.src,keishi/chromium,krieger-od/nwjs_chromium.src,chuan9/chromium-crosswalk,bright-sparks/chromium-spacewalk,anirudhSK/chromium,Jonekee/chromium.src,zcbenz/cefode-chromium,Fireblend/chromium-crosswalk,ChromiumWebApps/chromium,hujiajie/pa-chromium,jaruba/chromium.src,ondra-novak/chromium.src,rogerwang/chromium,Pluto-tv/chromium-crosswalk,crosswalk-project/chromium-crosswalk-efl,markYoungH/chromium.src,ondra-novak/chromium.src,PeterWangIntel/chromium-crosswalk,ChromiumWebApps/chromium,crosswalk-project/chromium-crosswalk-efl,Fireblend/chromium-crosswalk,PeterWangIntel/chromium-crosswalk,hgl888/chromium-crosswalk,hujiajie/pa-chromium,Pluto-tv/chromium-crosswalk,markYoungH/chromium.src,axinging/chromium-crosswalk,patrickm/chromium.src,keishi/chromium,mogoweb/chromium-crosswalk,littlstar/chromium.src,chuan9/chromium-crosswalk,anirudhSK/chromium,fujunwei/chromium-crosswalk,hgl888/chromium-crosswalk-efl,jaruba/chromium.src,ltilve/chromium,nacl-webkit/chrome_deps,Fireblend/chromium-crosswalk,Pluto-tv/chromium-crosswalk,ltilve/chromium,jaruba/chromium.src,M4sse/chromium.src,axinging/chromium-crosswalk,hgl888/chromium-crosswalk,Pluto-tv/chromium-crosswalk,dushu1203/chromium.src,hgl888/chromium-crosswalk,ChromiumWebApps/chromium,hgl888/chromium-crosswalk-efl,M4sse/chromium.src,markYoungH/chromium.src,anirudhSK/chromium,ondra-novak/chromium.src,pozdnyakov/chromium-crosswalk,krieger-od/nwjs_chromium.src,hgl888/chromium-crosswalk-efl,dednal/chromium.src,robclark/chromium,littlstar/chromium.src,dushu1203/chromium.src,chuan9/chromium-crosswalk,keishi/chromium,Jonekee/chromium.src,bright-sparks/chromium-spacewalk,PeterWangIntel/chromium-crosswalk,krieger-od/nwjs_chromium.src,dednal/chromium.src,fujunwei/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,zcbenz/cefode-chromium,Chilledheart/chromium,anirudhSK/chromium,Fireblend/chromium-crosswalk,Chilledheart/chromium,PeterWangIntel/chromium-crosswalk,Just-D/chromium-1,crosswalk-project/chromium-crosswalk-efl,keishi/chromium,junmin-zhu/chromium-rivertrail,axinging/chromium-crosswalk,keishi/chromium,Just-D/chromium-1,zcbenz/cefode-chromium,robclark/chromium,Jonekee/chromium.src,junmin-zhu/chromium-rivertrail,mogoweb/chromium-crosswalk,ondra-novak/chromium.src,rogerwang/chromium,littlstar/chromium.src,chuan9/chromium-crosswalk,ondra-novak/chromium.src,ltilve/chromium,dushu1203/chromium.src,pozdnyakov/chromium-crosswalk,ltilve/chromium,hgl888/chromium-crosswalk-efl,axinging/chromium-crosswalk,TheTypoMaster/chromium-crosswalk,ondra-novak/chromium.src,nacl-webkit/chrome_deps,Chilledheart/chromium,pozdnyakov/chromium-crosswalk,mohamed--abdel-maksoud/chromium.src,TheTypoMaster/chromium-crosswalk,Just-D/chromium-1,Fireblend/chromium-crosswalk,hgl888/chromium-crosswalk-efl,markYoungH/chromium.src,M4sse/chromium.src,M4sse/chromium.src,dushu1203/chromium.src,littlstar/chromium.src,markYoungH/chromium.src,junmin-zhu/chromium-rivertrail,Chilledheart/chromium,fujunwei/chromium-crosswalk,hujiajie/pa-chromium,Pluto-tv/chromium-crosswalk,hgl888/chromium-crosswalk-efl,chuan9/chromium-crosswalk,chuan9/chromium-crosswalk,hgl888/chromium-crosswalk-efl,krieger-od/nwjs_chromium.src,rogerwang/chromium,pozdnyakov/chromium-crosswalk,Jonekee/chromium.src,robclark/chromium,littlstar/chromium.src,Pluto-tv/chromium-crosswalk,jaruba/chromium.src,mohamed--abdel-maksoud/chromium.src,timopulkkinen/BubbleFish,markYoungH/chromium.src,zcbenz/cefode-chromium,dushu1203/chromium.src,timopulkkinen/BubbleFish,chuan9/chromium-crosswalk