Application Menu:Clear Browsing Data… should not have Clear Browsing Data  as the default action.  Buttons with destructive actions should never be the default.
Application Menu:Clear Browsing Data… should not have Clear Browsing Data 
as the default action.  Buttons with destructive actions should never be
the default.

This removes the return key equivalent from the Clear Browsing Data button.
It also adds an escape key equivalent to the Cancel button, so that it will
blink appropriately in response to both escape and command-period.

BUG=21461
TEST=Look and try as above
Review URL: http://codereview.chromium.org/194068

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25862 0039d316-1c4b-4281-b951-d872f2087c98

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