chromeos/login: Remove unused username_view.h header file.
chromeos/login: Remove unused username_view.h header file.

This file appears to be left out from some refactoring. So since no ones is
using this file, and it doesn't even has a source file with the implementation,
just remove it now.

BUG=110016
R=avayvod@chromium.org

Review URL: https://chromiumcodereview.appspot.com/10387002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@135638 0039d316-1c4b-4281-b951-d872f2087c98

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