Do not attempt to set Chrome as default if Chrome is already default.
Do not attempt to set Chrome as default if Chrome is already default.

R=grt@chromium.org
BUG=142943
TEST=Reinstall Chrome with "make_chrome_default_for_user":true in master_preferences and make sure you don't see the default prompt on Win8 if Chrome is already default.


Review URL: https://chromiumcodereview.appspot.com/11194018

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@162505 0039d316-1c4b-4281-b951-d872f2087c98

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