content: Cleanup class/struct forward declarations

content/public/browser/render_process_host.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_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 11 matching lines @@
 
 class GURL;
 
 namespace base {
 class SharedPersistentMemoryAllocator;
 class TimeDelta;
 }
 
 namespace media {
 class AudioOutputController;
-class MediaKeys;
 }
 
 namespace service_manager {
 class Connection;
 class InterfaceProvider;
 }
 
 namespace content {
 class BrowserContext;
 class BrowserMessageFilter;
 class RenderProcessHostObserver;
-class RenderWidgetHost;
 class StoragePartition;
 struct GlobalRequestID;
 
 namespace mojom {
 class Renderer;
 }
 
 // Interface that represents the browser side of the browser <-> renderer
 // communication channel. There will generally be one RenderProcessHost per
 // renderer process.
@@ skipping 334 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_