Chromium change: https://github.com/chromium/chromium/commit/abc5c8db8cc036982f11f945eec7573104d22e52 [Android][Signin] Merge SigninStateObserver and SigninAllowedObserver… … into one This CL refactors the SigninManager observers by merging SigninStateObserver and SigninAllowedObserver into one. Bug: 1152333