Move Extension into extensions namespace

chrome/browser/ui/views/extensions/extension_view.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_VIEWS_EXTENSIONS_EXTENSION_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_VIEW_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/views/controls/native/native_view_host.h"
 
 class Browser;
-class Extension;
 class ExtensionHost;
 class ExtensionView;
 
+namespace extensions {
+class Extension;
+}
+
 namespace content {
 class RenderViewHost;
 }
 
 // This handles the display portion of an ExtensionHost.
 class ExtensionView : public views::NativeViewHost {
  public:
   ExtensionView(ExtensionHost* host, Browser* browser);
   virtual ~ExtensionView();
 
   // A class that represents the container that this view is in.
   // (bottom shelf, side bar, etc.)
   class Container {
    public:
     virtual ~Container() {}
     virtual void OnExtensionSizeChanged(ExtensionView* view) {}
     virtual void OnViewWasResized() {}
   };
 
   ExtensionHost* host() const { return host_; }
   Browser* browser() const { return browser_; }
-  const Extension* extension() const;
+  const extensions::Extension* extension() const;
   content::RenderViewHost* render_view_host() const;
   void DidStopLoading();
   void SetIsClipped(bool is_clipped);
 
   // Notification from ExtensionHost.
   void ResizeDueToAutoResize(const gfx::Size& new_size);
 
   // Method for the ExtensionHost to notify us when the RenderViewHost has a
   // connection.
   void RenderViewCreated();
@@ skipping 51 matching lines @@
   // Note: the view does not own its container.
   Container* container_;
 
   // Whether this extension view is clipped.
   bool is_clipped_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_VIEW_H_