content: Cleanup class/struct forward declarations

content/renderer/render_frame_impl.h

 // Copyright 2013 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_RENDER_FRAME_IMPL_H_
 #define CONTENT_RENDERER_RENDER_FRAME_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 76 matching lines @@
 enum class WebCachePolicy;
 struct WebCompositionUnderline;
 struct WebContextMenuData;
 struct WebCursorInfo;
 struct WebFindOptions;
 }  // namespace blink
 
 namespace gfx {
 class Point;
 class Range;
-class Rect;
 }
 
 namespace media {
 class CdmFactory;
 class DecoderFactory;
 class MediaPermission;
 class RemotingRendererController;
 class RemotingSinkObserver;
 class RendererWebMediaPlayerDelegate;
 class SurfaceManager;
@@ skipping 19 matching lines @@
 class DevToolsAgent;
 class DocumentState;
 class ExternalPopupMenu;
 class HistoryEntry;
 class ManifestManager;
 class MediaInterfaceProvider;
 class MediaStreamDispatcher;
 class MediaStreamRendererFactory;
 class MediaPermissionDispatcher;
 class NavigationState;
-class PageState;
 class PepperPluginInstanceImpl;
 class PresentationDispatcher;
 class PushMessagingDispatcher;
 class RenderAccessibilityImpl;
 class RendererMediaPlayerManager;
 class RendererMediaSessionManager;
 class RendererPpapiHost;
 class RenderFrameObserver;
 class RenderViewImpl;
 class RenderWidget;
@@ skipping 1196 matching lines @@
   bool browser_side_navigation_pending_ = false;
 
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_FRAME_IMPL_H_