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The purpose of this change is to move ProfileOAuth2TokenServiceRequest
into google_apis/gaia and drop any browser dependencies.

ProfileOAuth2TokenServiceRequest becomes OAuth2TokenServiceRequest.

Add support for invalidating tokens.

Review URL: https://codereview.chromium.org/299943003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274255 0039d316-1c4b-4281-b951-d872f2087c98