Move Singleton and related structs to namespace base

chrome/browser/ui/views/app_list/linux/app_list_service_linux.cc

 // Copyright 2013 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/ui/views/app_list/linux/app_list_service_linux.h"
 
 #include "base/memory/singleton.h"
 #include "base/thread_task_runner_handle.h"
 #include "chrome/browser/apps/scoped_keep_alive.h"
 #include "chrome/browser/shell_integration.h"
@@ skipping 23 matching lines @@
     LOG(WARNING) << "Unable to create App Launcher shortcut.";
   }
 }
 
 }  // namespace
 
 AppListServiceLinux::~AppListServiceLinux() {}
 
 // static
 AppListServiceLinux* AppListServiceLinux::GetInstance() {
-  return Singleton<AppListServiceLinux,
-                   LeakySingletonTraits<AppListServiceLinux> >::get();
+  return base::Singleton<AppListServiceLinux, base::LeakySingletonTraits<
+                                                  AppListServiceLinux>>::get();
 }
 
 void AppListServiceLinux::CreateShortcut() {
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE, base::Bind(&CreateShortcuts));
 }
 
 void AppListServiceLinux::OnActivationChanged(views::Widget* /*widget*/,
                                               bool active) {
   if (active)
@@ skipping 36 matching lines @@
 
   return AppListServiceLinux::GetInstance();
 }
 
 // static
 void AppListService::InitAll(Profile* initial_profile,
                              const base::FilePath& profile_path) {
   AppListServiceAsh::GetInstance()->Init(initial_profile);
   AppListServiceLinux::GetInstance()->Init(initial_profile);
 }