Cleanup: Remove unneeded forward declarations in chrome/browser/sync.

chrome/browser/sync/glue/theme_model_associator.h

 // Copyright (c) 2011 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_SYNC_GLUE_THEME_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_SYNC_GLUE_THEME_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/sync/glue/model_associator.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 class ProfileSyncService;
 
 namespace browser_sync {
 
-class UnrecoverableErrorHandler;
-
 // Contains all logic for associating the Chrome themes model and the
 // sync themes model.
 class ThemeModelAssociator : public AssociatorInterface {
  public:
   explicit ThemeModelAssociator(ProfileSyncService* sync_service);
   virtual ~ThemeModelAssociator();
 
   // Used by profile_sync_test_util.h.
   static syncable::ModelType model_type() { return syncable::THEMES; }
 
   // AssociatorInterface implementation.
   virtual bool AssociateModels(SyncError* error);
   virtual bool DisassociateModels(SyncError* error);
   virtual bool SyncModelHasUserCreatedNodes(bool* has_nodes);
   virtual void AbortAssociation() {
     // No implementation needed, this associator runs on the main
     // thread.
   }
   virtual bool CryptoReadyIfNecessary();
 
  private:
   ProfileSyncService* sync_service_;
 
   DISALLOW_COPY_AND_ASSIGN(ThemeModelAssociator);
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_THEME_MODEL_ASSOCIATOR_H_