Componentizing GcmProfileService.
This class is shared by shared by the iOS port, and thus needs to decouple
from //chrome dependencies for clean integration on iOS.
This CL:
-- Pass PrefService, FilePath, net::URLRequestContextGetter,SigninManagerBase,
ProfileOAuth2TokenService, base::Closure etc instead of profile.
-- Added a new file for constants.
BUG=
519585
TBR=rockot,stevenjb,rkc,fgorski,dcheng,skuhne,isherman,bauerb
Committed:
https://crrev.com/7554194aec4024a5409d2de575d8b59e4d9679c2
Cr-Commit-Position: refs/heads/master@{#357609}