Move small c/b/extensions classes into extensions namespace no.1

chrome/browser/extensions/app_shortcut_manager.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/app_shortcut_manager.h"
 
 #include "base/command_line.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 #include "grit/theme_resources.h"
 #include "skia/ext/image_operations.h"
 #include "ui/base/resource/resource_bundle.h"
 
-using extensions::Extension;
+namespace extensions {
 
 namespace {
 // Allow tests to disable shortcut creation, to prevent developers' desktops
 // becoming overrun with shortcuts.
 bool disable_shortcut_creation_for_tests = false;
 
 #if defined(OS_MACOSX)
 const int kDesiredSizes[] = {16, 32, 128, 256, 512};
 #else
 const int kDesiredSizes[] = {32};
@@ skipping 115 matching lines @@
   // immediately.
   tracker_.LoadImages(extension, info_list, ImageLoadingTracker::DONT_CACHE);
 }
 
 void AppShortcutManager::DeleteApplicationShortcuts(
     const Extension* extension) {
   ShellIntegration::ShortcutInfo delete_info =
       ShortcutInfoForExtensionAndProfile(extension, profile_);
   web_app::DeleteAllShortcuts(delete_info);
 }
+
+}  // namespace extensions