Ask for PPB_Instance;0.5 first, fallback to PPB_Instance;0.4.
Ask for PPB_Instance;0.5 first, fallback to PPB_Instance;0.4.

This fixes a regression introduced in http://codereview.chromium.org/7058015 whereby the browser would ask for 0.4 first, which breaks any plugins that have ported to the 0.5 version.  The fact that the version was omitted in both places kept 0.4 versions working (sometimes two wrongs do make a right!).

BUG=None
TEST=None


Review URL: http://codereview.chromium.org/7184030

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89435 0039d316-1c4b-4281-b951-d872f2087c98

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