Move ExtensionHost into extensions namespace

chrome/browser/ui/gtk/extensions/extension_view_gtk.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 CHROME_BROWSER_UI_GTK_EXTENSIONS_EXTENSION_VIEW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_EXTENSIONS_EXTENSION_VIEW_GTK_H_
 
 #include "base/basictypes.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 class Browser;
-class ExtensionHost;
 class SkBitmap;
 
 namespace content {
 class RenderViewHost;
 }
 
+namespace extensions {
+class ExtensionHost;
+}
+
 class ExtensionViewGtk {
  public:
-  ExtensionViewGtk(ExtensionHost* extension_host, Browser* browser);
+  ExtensionViewGtk(extensions::ExtensionHost* extension_host, Browser* browser);
 
   class Container {
    public:
     virtual ~Container() {}
     virtual void OnExtensionSizeChanged(ExtensionViewGtk* view,
                                         const gfx::Size& new_size) {}
   };
 
   void Init();
 
@@ skipping 13 matching lines @@
   // connection.
   void RenderViewCreated();
 
   content::RenderViewHost* render_view_host() const;
 
  private:
   void CreateWidgetHostView();
 
   Browser* browser_;
 
-  ExtensionHost* extension_host_;
+  extensions::ExtensionHost* extension_host_;
 
   // The background the view should have once it is initialized. This is set
   // when the view has a custom background, but hasn't been initialized yet.
   SkBitmap pending_background_;
 
   // This view's container.
   Container* container_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionViewGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_EXTENSIONS_EXTENSION_VIEW_GTK_H_