content: Cleanup class/struct forward declarations

content/browser/browser_plugin/browser_plugin_embedder.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.
 
 // A BrowserPluginEmbedder handles messages coming from a BrowserPlugin's
 // embedder that are not directed at any particular existing guest process.
 // In the beginning, when a BrowserPlugin instance in the embedder renderer
 // process requests an initial navigation, the WebContents for that renderer
 // renderer creates a BrowserPluginEmbedder for itself. The
 // BrowserPluginEmbedder, in turn, forwards the requests to a
 // BrowserPluginGuestManager, which creates and manages the lifetime of the new
 // guest.
 
 #ifndef CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_
 #define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "third_party/WebKit/public/platform/WebDragOperation.h"
 
 struct BrowserPluginHostMsg_Attach_Params;
 
 namespace content {
 
 class BrowserPluginGuest;
 class BrowserPluginGuestManager;
-class RenderWidgetHostImpl;
 struct NativeWebKeyboardEvent;
 
 class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver {
  public:
   ~BrowserPluginEmbedder() override;
 
   static BrowserPluginEmbedder* Create(WebContentsImpl* web_contents);
 
   // Called when embedder's |rwh| has sent screen rects to renderer.
   void DidSendScreenRects();
@@ skipping 95 matching lines @@
   bool guest_drag_ending_;
 
   base::WeakPtrFactory<BrowserPluginEmbedder> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_