Move Extension into extensions namespace

chrome/browser/extensions/extension_sorting.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_sorting.h"
 
 #include "chrome/browser/extensions/extension_scoped_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_notification_types.h"
@@ skipping 478 matching lines @@
        it != page_map->second.end(); ++it) {
     if (it->second == extension_id) {
       page_map->second.erase(it);
       break;
     }
   }
 }
 
 void ExtensionSorting::SyncIfNeeded(const std::string& extension_id) {
   if (extension_service_) {
-    const Extension* ext =
+    const extensions::Extension* ext =
         extension_service_->GetInstalledExtension(extension_id);
 
     if (ext) {
       // It is possible for old extension to have ordinal values, but they
       // shouldn't so we clear them.
       if (!ext->is_app())
         ClearOrdinals(extension_id);
 
       extension_service_->SyncExtensionChangeIfNeeded(*ext);
     }
   }
 }