Move Extension into extensions namespace

chrome/browser/extensions/extension_tabs_module.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_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "googleurl/src/gurl.h"
 
 class BackingStore;
-class Extension;
 class GURL;
 class SkBitmap;
 class TabContentsWrapper;
+
 namespace base {
 class DictionaryValue;
-}  // namespace base
+}
+
 namespace content {
 class WebContents;
-}  // namespace content
+}
+
 namespace skia {
 class PlatformCanvas;
-}  // namespace skia
+}
 
 // Windows
 class GetWindowFunction : public SyncExtensionFunction {
   virtual ~GetWindowFunction() {}
   virtual bool RunImpl() OVERRIDE;
   DECLARE_EXTENSION_FUNCTION_NAME("windows.get")
 };
 class GetCurrentWindowFunction : public SyncExtensionFunction {
   virtual ~GetCurrentWindowFunction() {}
   virtual bool RunImpl() OVERRIDE;
@@ skipping 145 matching lines @@
   // The format (JPEG vs PNG) of the resulting image.  Set in RunImpl().
   ImageFormat image_format_;
 
   // Quality setting to use when encoding jpegs.  Set in RunImpl().
   int image_quality_;
 
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.captureVisibleTab")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TABS_MODULE_H__