Abort sync setup if Sync gets disabled through policy.
Abort sync setup if Sync gets disabled through policy.

If the policy kicks in while the user is looking at the data type
selection screen, we should not DCHECK and end up in a state where sync
controls are disabled.

BUG=chromium:99753
TEST=See bug report.


Review URL: http://codereview.chromium.org/8234001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@105343 0039d316-1c4b-4281-b951-d872f2087c98

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