Move Extension into extensions namespace

chrome/browser/extensions/extension_tab_util.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_TAB_UTIL_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H__
 #pragma once
 
 #include <string>
 
 class Browser;
-class Extension;
 class GURL;
 class Profile;
 class TabContentsWrapper;
 class TabStripModel;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
 namespace content {
 class WebContents;
 }
 
+namespace extensions {
+class Extension;
+}
+
 // Provides various utility functions that help manipulate tabs.
 class ExtensionTabUtil {
  public:
   static int GetWindowId(const Browser* browser);
   static int GetWindowIdOfTabStripModel(const TabStripModel* tab_strip_model);
   static int GetTabId(const content::WebContents* web_contents);
   static bool GetTabIdFromArgument(const base::ListValue &args,
                                    int argument_index,
                                    int *tab_id, std::string* error_message);
   static std::string GetTabStatusText(bool is_loading);
@@ skipping 27 matching lines @@
 
   // Takes |url_string| and returns a GURL which is either valid and absolute
   // or invalid. If |url_string| is not directly interpretable as a valid (it is
   // likely a relative URL) an attempt is made to resolve it. |extension| is
   // provided so it can be resolved relative to its extension base
   // (chrome-extension://<id>/). Using the source frame url would be more
   // correct, but because the api shipped with urls resolved relative to their
   // extension base, we decided it wasn't worth breaking existing extensions to
   // fix.
   static GURL ResolvePossiblyRelativeURL(const std::string& url_string,
-                                         const Extension* extension);
+      const extensions::Extension* extension);
 
   // Returns true if |url| is used for testing crashes.
   static bool IsCrashURL(const GURL& url);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TAB_UTIL_H__