content: Cleanup class/struct forward declarations

content/browser/service_worker/service_worker_internals_ui.h

 // Copyright 2014 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 CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INTERNALS_UI_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INTERNALS_UI_H_
 
 #include <memory>
 #include <set>
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/service_worker/service_worker_context_observer.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "content/public/browser/web_ui_controller.h"
 
 namespace base {
 class ListValue;
-class DictionaryValue;
 }
 
 namespace content {
 
 class StoragePartition;
 class ServiceWorkerContextWrapper;
 class ServiceWorkerVersion;
 
 class ServiceWorkerInternalsUI
     : public WebUIController,
@@ skipping 36 matching lines @@
                            const StatusCallback& callback) const;
 
   base::ScopedPtrHashMap<uintptr_t, std::unique_ptr<PartitionObserver>>
       observers_;
   int next_partition_id_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_INTERNALS_UI_H_