ash: Fix crash when playing with brightness controller in uber tray menu.
ash: Fix crash when playing with brightness controller in uber tray menu.

BUG=117059
R=sadrul@chromium.org,ben@chromium.org

Review URL: https://chromiumcodereview.appspot.com/9616041

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125504 0039d316-1c4b-4281-b951-d872f2087c98

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