Make header copyable in views info bubble; add a comment about description.
Make header copyable in views info bubble; add a comment about description.

This change makes the info bubble text copyable by changing it from a Label
to a Textfield (similar to how it's done in about_chrome_view.cc for the 
version text). Unfortunately, the same can't yet be done to the description
label since currently a textfield cannot be multiline. I've added a comment
to that extent.

BUG=52526
TEST=manual

Review URL: http://codereview.chromium.org/7316022

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@92169 0039d316-1c4b-4281-b951-d872f2087c98

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