This is the second CL of several that will eventually replace TokenService with

chrome/browser/signin/android_profile_oauth2_token_service.h

 // Copyright 2013 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_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_
 
 #include <jni.h>
 #include <string>
 
 #include "base/android/jni_helper.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "chrome/browser/signin/profile_oauth2_token_service.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 
-class TokenService;
-
-
 // A specialization of ProfileOAuth2TokenService that will be returned by
 // ProfileOAuth2TokenServiceFactory for OS_ANDROID.  This instance uses
 // native Android features to lookup OAuth2 tokens.
 //
 // See |ProfileOAuth2TokenService| for usage details.
 //
 // Note: requests should be started from the UI thread. To start a
 // request from other thread, please use ProfileOAuth2TokenServiceRequest.
 class AndroidProfileOAuth2TokenService : public ProfileOAuth2TokenService {
  public:
@@ skipping 63 matching lines @@
   // Called to notify observers when refresh tokans have been loaded.
   virtual void FireRefreshTokensLoaded() OVERRIDE;
 
  private:
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   DISALLOW_COPY_AND_ASSIGN(AndroidProfileOAuth2TokenService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_ANDROID_PROFILE_OAUTH2_TOKEN_SERVICE_H_