Fix Extension Command popup crash (regression from https://chromiumcodereview.appspot.com/10537047/) and (while we're at it, make sure the extension popup points to the chevron if an extension command triggers the popup to appear while the extension button is in the overflow menu.
Fix Extension Command popup crash (regression from https://chromiumcodereview.appspot.com/10537047/) and (while we're at it, make sure the extension popup points to the chevron if an extension command triggers the popup to appear while the extension button is in the overflow menu.

Reason for crash: BrowserActionButton::OnGtkAccelerator was passing in NULL widget to OnClicked. Now we pass a widget.

TEST=Install an extension with a command associated with a browser action popup. Trigger that popup to appear with the keystroke assigned to it. Make sure the popup appears.
BUG=27702
Review URL: https://chromiumcodereview.appspot.com/10536115

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@142371 0039d316-1c4b-4281-b951-d872f2087c98

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