Fix crash in TabContentsViewViews::Focus. This was caused by r125126. The subtle bug is that the SadTabHelper's Observe function use to reset TabContentsViewView's Widget pointer before it deleted the sad tab Widget. With my change, TabContentsViewWin would call SadTabHelper in the middle of its sad_tab_.reset() call and would use a Widget that's being destructed.
Fix crash in TabContentsViewViews::Focus. This was caused by r125126. The subtle bug is that the SadTabHelper's Observe function use to reset TabContentsViewView's Widget pointer before it deleted the sad tab Widget. With my change, TabContentsViewWin would call SadTabHelper in the middle of its sad_tab_.reset() call and would use a Widget that's being destructed.

BUG=117668
Review URL: https://chromiumcodereview.appspot.com/9733023

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@127686 0039d316-1c4b-4281-b951-d872f2087c98

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