content: Cleanup class/struct forward declarations

content/renderer/shared_worker/embedded_shared_worker_stub.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_RENDERER_SHARED_WORKER_EMBEDDED_SHARED_WORKER_STUB_H_
 #define CONTENT_RENDERER_SHARED_WORKER_EMBEDDED_SHARED_WORKER_STUB_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "content/child/child_message_filter.h"
 #include "content/child/scoped_child_process_reference.h"
 #include "ipc/ipc_listener.h"
 #include "third_party/WebKit/public/platform/WebAddressSpace.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebContentSecurityPolicy.h"
 #include "third_party/WebKit/public/web/WebSharedWorkerClient.h"
 #include "url/gurl.h"
 
 namespace blink {
 class WebApplicationCacheHost;
 class WebApplicationCacheHostClient;
-class WebMessagePortChannel;
 class WebNotificationPresenter;
 class WebSecurityOrigin;
 class WebSharedWorker;
 class WebWorkerContentSettingsClientProxy;
 }
 
 namespace content {
 class SharedWorkerDevToolsAgent;
 class WebApplicationCacheHostImpl;
 class WebMessagePortChannelImpl;
@@ skipping 69 matching lines @@
   PendingChannelList pending_channels_;
 
   ScopedChildProcessReference process_ref_;
   WebApplicationCacheHostImpl* app_cache_host_ = nullptr;
   DISALLOW_COPY_AND_ASSIGN(EmbeddedSharedWorkerStub);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_SHARED_WORKER_EMBEDDED_SHARED_WORKER_STUB_H_