ui/base/models: Remove unnecessary virtuals from ListModel functions.
ui/base/models: Remove unnecessary virtuals from ListModel functions.

ListModel is intended to be used as composition not inheritance, so it's
unlikely these functions will be needed to be overridden, and they aren't until
now, so let's not make them virtual for now.

R=xiyuan@chromium.org
TBR=sky@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10332264

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@138062 0039d316-1c4b-4281-b951-d872f2087c98

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