content: Cleanup class/struct forward declarations

content/browser/renderer_host/render_view_host_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_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 22 matching lines @@
 #include "third_party/WebKit/public/web/WebConsoleMessage.h"
 #include "third_party/WebKit/public/web/WebPopupType.h"
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/base/window_open_disposition.h"
 
 class SkBitmap;
 
 namespace content {
 
 class PageState;
-class RenderWidgetHostDelegate;
 class SessionStorageNamespace;
-struct FileChooserFileInfo;
-struct FileChooserParams;
 struct FrameReplicationState;
 
 namespace mojom {
 class CreateNewWindowParams;
 }
 
 // This implements the RenderViewHost interface that is exposed to
 // embedders of content, and adds things only visible to content.
 //
 // The exact API of this object needs to be more thoroughly designed. Right
@@ skipping 339 matching lines @@
   bool render_view_ready_on_process_launch_;
 
   base::WeakPtrFactory<RenderViewHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_IMPL_H_