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This CL introduces a level of indirection around ProfileOAuth2TokenService
(ProfileOAuth2TokenServiceWrapper) to eliminate PO2TS being a BCKS. The only
purpose of the wrapper class is to glue a PO2TS instance to a Profile; the
wrapper has no public API. In particular, PO2TSFactory still vends PO2TS
instances.

BUG=334187
TBR=jochen

Review URL: https://codereview.chromium.org/148513010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251444 0039d316-1c4b-4281-b951-d872f2087c98