Revert 40521 - Fix attempt for bug 34158. Reset the TalkMediator after calling Logout to ensure it is destroyed from the core thread.  This ensures the task to destroy the GaiaAuth object is run on the core thread and not the UI thread.
Revert 40521 - Fix attempt for bug 34158. Reset the TalkMediator after calling Logout to ensure it is destroyed from the
core thread.  This ensures the task to destroy the GaiaAuth object is run on
the core thread and not the UI thread.

Fred and I debugged this together and actually saw a second crash appear to result
from this change, but then we did a clean build and were unable to repro that crash,
so I think this as a net win at the moment.

BUG=34158,37771

Review URL: http://codereview.chromium.org/660437

TBR=akalin@chromium.org
Review URL: http://codereview.chromium.org/738002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@41071 0039d316-1c4b-4281-b951-d872f2087c98

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