Enforce the use of a root window
Enforce the use of a root window

So for metro we need to have a specific root window, so we
need to enforce it. We know we are in metro because of the metro_driver
dll being loaded (it was loaded by chrome.exe)

I also removed your last change. I assume that you gathered enough data
by now.

BUG=118641
TES=chrome runs
Review URL: https://chromiumcodereview.appspot.com/9965094

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@130540 0039d316-1c4b-4281-b951-d872f2087c98

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