content: Cleanup class/struct forward declarations

content/child/child_thread_impl.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 CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 #define CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 30 matching lines @@
 namespace service_manager {
 class Connection;
 }  // namespace service_manager
 
 namespace mojo {
 namespace edk {
 class ScopedIPCSupport;
 }  // namespace edk
 }  // namespace mojo
 
-namespace blink {
-class WebFrame;
-}  // namespace blink
-
 namespace discardable_memory {
 class ClientDiscardableSharedMemoryManager;
 }  // namespace discardable_memory
 
 namespace content {
-class ChildMessageFilter;
 class ChildHistogramMessageFilter;
 class ChildResourceMessageFilter;
 class ChildSharedBitmapManager;
 class FileSystemDispatcher;
 class InProcessChildThreadParams;
 class NotificationDispatcher;
 class PushDispatcher;
 class ServiceWorkerMessageFilter;
 class QuotaDispatcher;
 class QuotaMessageFilter;
 class ResourceDispatcher;
 class ThreadSafeSender;
-struct RequestInfo;
 
 // The main thread of a child process derives from this class.
 class CONTENT_EXPORT ChildThreadImpl
     : public IPC::Listener,
       virtual public ChildThread,
       NON_EXPORTED_BASE(public mojom::RouteProvider),
       NON_EXPORTED_BASE(public mojom::AssociatedInterfaceProvider) {
  public:
   struct CONTENT_EXPORT Options;
 
@@ skipping 299 matching lines @@
 
  private:
   struct Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_IMPL_H_