Add ManagedUserTokenFetcher to fetch scoped-down tokens.

chrome/browser/signin/oauth2_token_service.h

Index: chrome/browser/signin/oauth2_token_service.h
diff --git a/chrome/browser/signin/oauth2_token_service.h b/chrome/browser/signin/oauth2_token_service.h
index 9260f4179fae0ee9cdcb7d250ff90b577a074417..e96b9c17c3d84c16f364b707b646de6ef06fcb87 100644
--- a/chrome/browser/signin/oauth2_token_service.h
+++ b/chrome/browser/signin/oauth2_token_service.h
@@ -148,12 +148,6 @@ class OAuth2TokenService {
     Consumer* const consumer_;
   };
 
-  // Informs the consumer of |request| fetch results.
-  static void InformConsumer(base::WeakPtr<RequestImpl> request,
-                             const GoogleServiceAuthError& error,
-                             const std::string& access_token,
-                             const base::Time& expiration_date);
-
  private:
   // Class that fetches an OAuth2 access token for a given set of scopes and
   // OAuth2 refresh token.