Move a bunch of code in content\renderer to the content namespace.

content/renderer/render_widget_fullscreen.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_RENDERER_RENDER_WIDGET_FULLSCREEN_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_FULLSCREEN_H_
 
 #include "content/renderer/render_widget.h"
 
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebWidget.h"
 
+namespace content {
+
 // TODO(boliu): Override non-supported methods with no-op? eg setWindowRect().
 class RenderWidgetFullscreen : public RenderWidget {
  public:
   // Creates a new RenderWidget.  The opener_id is the routing ID of the
   // RenderView that this widget lives inside.
   static RenderWidgetFullscreen* Create(int32 opener_id);
 
   virtual void show(WebKit::WebNavigationPolicy);
 
  protected:
   RenderWidgetFullscreen(const WebKit::WebScreenInfo& screen_info);
   virtual ~RenderWidgetFullscreen();
 
   virtual WebKit::WebWidget* CreateWebWidget();
 
   void Init(int32 opener_id);
 };
 
+}  // namespace content
+
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_FULLSCREEN_H_