Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/renderer_host/render_widget_host_view_views.h

 // Copyright (c) 2011 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 CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_VIEWS_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_VIEWS_H_
 #pragma once
 
 #include <map>
 #include <string>
@@ skipping 21 matching lines @@
 namespace ui {
 enum TouchStatus;
 }
 #endif
 
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
 class AcceleratedSurfaceContainerLinux;
 #endif
 
 class RenderWidgetHost;
-struct NativeWebKeyboardEvent;
 
 // -----------------------------------------------------------------------------
 // See comments in render_widget_host_view.h about this class and its members.
 // -----------------------------------------------------------------------------
 class RenderWidgetHostViewViews : public RenderWidgetHostView,
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
                                   public ui::CompositorObserver,
 #endif
                                   public views::TouchSelectionClientView,
                                   public ui::TextInputClient,
@@ skipping 259 matching lines @@
 
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
   std::map<uint64, scoped_refptr<AcceleratedSurfaceContainerLinux> >
       accelerated_surface_containers_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewViews);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_VIEWS_H_