Revert 170185 - Update V8 to version 3.15.6.2.
Revert 170185 - Update V8 to version 3.15.6.2.

Caused a bunch of webkit layout tests to fail on various bots.

For example,
http/tests/navigation/navigation-interrupted-by-fragment.html on Linux and Mac
transitions/cancel-transition.html on mac and linux
and more

R=jkummerow@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11299249

TBR=mstarzinger@chromium.org
Review URL: https://codereview.chromium.org/11414234

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@170226 0039d316-1c4b-4281-b951-d872f2087c98

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