Revert 63651 (turned chromeos red, http://build.chromium.org/buildbot/waterfall/builders/Linux%20Builder%20(ChromiumOS%20dbg)/builds/1895/steps/ui_tests/logs/LoadOptionsByURL )- Add LeakTracker<URLRequestContext> to IOThread::CleanUp().
Revert 63651 (turned chromeos red, http://build.chromium.org/buildbot/waterfall/builders/Linux%20Builder%20(ChromiumOS%20dbg)/builds/1895/steps/ui_tests/logs/LoadOptionsByURL )- Add LeakTracker<URLRequestContext> to IOThread::CleanUp().

Move LeakTracker<URLRequest> up to CleanUp also.  No URLRequest should be getting killed in DestructionObservers anymore.

BUG=59630
TEST=existing

Review URL: http://codereview.chromium.org/4064004

TBR=willchan@chromium.org
Review URL: http://codereview.chromium.org/4069002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@63731 0039d316-1c4b-4281-b951-d872f2087c98

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