Reduce usage of ProfileOAuth2TokenService::GetPrimaryAccountID()

Replace calls to ProfileOAuth2TokenService::GetPrimaryAccountId() with
SigninManagerBase::GetAuthenticatedAccountId() in chrome\browser\signin and chrome\browser\android\signin.

BUG=333995

Review URL: https://codereview.chromium.org/143783008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@246572 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 246572