[GTK] polish first run dialog
[GTK] polish first run dialog

1) move "make default" above crash reporting checkbox
2) remove Xs from top right of the first run dialogs (this is mostly aesthetic, some WMs will ignore this flag; we don't do anything crazy if users do manage to close the window(s) without making a selection)
3) remove extra vertical space between crash reporting checkbox and learn more link
4) remove "quit" button on 2nd dialog

BUG=49705
TEST=manual

Review URL: http://codereview.chromium.org/3402036

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@60865 0039d316-1c4b-4281-b951-d872f2087c98

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