Move Extension into extensions namespace

chrome/browser/ui/cocoa/extensions/extension_action_context_menu.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/extensions/extension_action_context_menu.h"
 
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
@@ skipping 20 matching lines @@
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/web_contents.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 using content::OpenURLParams;
 using content::Referrer;
 using content::WebContents;
+using extensions::Extension;
 
 // A class that loads the extension icon on the I/O thread before showing the
 // confirmation dialog to uninstall the given extension.
 // Also acts as the extension's UI delegate in order to display the dialog.
 class AsyncUninstaller : public ExtensionUninstallDialog::Delegate {
  public:
   AsyncUninstaller(const Extension* extension, Profile* profile)
       : extension_(extension),
         profile_(profile) {
     extension_uninstall_dialog_.reset(
@@ skipping 152 matching lines @@
 
 - (BOOL)validateMenuItem:(NSMenuItem*)menuItem {
   if ([menuItem tag] == kExtensionContextOptions) {
     // Disable 'Options' if there are no options to set.
     return extension_->options_url().spec().length() > 0;
   }
   return YES;
 }
 
 @end