Move BrowserThread to content namespace.

chrome/browser/extensions/extension_settings_frontend.cc

 // Copyright (c) 2011 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_settings_frontend.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "chrome/browser/extensions/extension_event_names.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_settings_backend.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
 
+using content::BrowserThread;
+
 class ExtensionSettingsFrontend::DefaultObserver
     : public ExtensionSettingsObserver {
  public:
   explicit DefaultObserver(Profile* profile) : target_profile_(profile) {}
   virtual ~DefaultObserver() {}
 
   virtual void OnSettingsChanged(
       const Profile* origin_profile,
       const std::string& extension_id,
       const ExtensionSettingChanges& changes) OVERRIDE {
@@ skipping 160 matching lines @@
   AddObserver(observer->get());
 }
 
 void ExtensionSettingsFrontend::ClearDefaultObserver(
     scoped_ptr<DefaultObserver>* observer) {
   if (observer->get()) {
     RemoveObserver(observer->get());
     observer->reset();
   }
 }