Misc cleanups in Drive code.

chrome/browser/google_apis/auth_service_interface.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_GOOGLE_APIS_AUTH_SERVICE_INTERFACE_H_
 #define CHROME_BROWSER_GOOGLE_APIS_AUTH_SERVICE_INTERFACE_H_
 
 #include <string>
 
-#include "chrome/browser/google_apis/base_operations.h"
+#include "base/callback_forward.h"
 #include "chrome/browser/google_apis/gdata_errorcode.h"
 
 class Profile;
 
 namespace google_apis {
 
+class AuthServiceObserver;
 class OperationRegistry;
-class AuthServiceObserver;
 
 // Called when fetching of access token is complete.
 typedef base::Callback<void(GDataErrorCode error,
                             const std::string& access_token)>
     AuthStatusCallback;
 
 // This defines an interface for the authentication service which is required
 // by authenticated operations (AuthenticatedOperationInterface).
 // All functions must be called on UI thread.
 class AuthServiceInterface {
@@ skipping 27 matching lines @@
   // Clears OAuth2 access token.
   virtual void ClearAccessToken() = 0;
 
   // Clears OAuth2 refresh token.
   virtual void ClearRefreshToken() = 0;
 };
 
 }  // namespace google_apis
 
 #endif  // CHROME_BROWSER_GOOGLE_APIS_AUTH_SERVICE_INTERFACE_H_