Move Singleton and related structs to namespace base

ui/events/devices/x11/device_list_cache_x11.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 "ui/events/devices/x11/device_list_cache_x11.h"
 
 #include <algorithm>
 
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 13 matching lines @@
 
 namespace ui {
 
 DeviceListCacheX11::DeviceListCacheX11() {
 }
 
 DeviceListCacheX11::~DeviceListCacheX11() {
 }
 
 DeviceListCacheX11* DeviceListCacheX11::GetInstance() {
-  return Singleton<DeviceListCacheX11>::get();
+  return base::Singleton<DeviceListCacheX11>::get();
 }
 
 void DeviceListCacheX11::UpdateDeviceList(Display* display) {
   XDeviceList& new_x_dev_list = x_dev_list_;
   new_x_dev_list.devices.reset(
       XListInputDevices(display, &new_x_dev_list.count));
 
   XIDeviceList& new_xi_dev_list = xi_dev_list_;
   new_xi_dev_list.devices.reset(
       IsXI2Available()
@@ skipping 13 matching lines @@
   XIDeviceList& xi_dev_list = xi_dev_list_;
   if (!xi_dev_list.devices && !xi_dev_list.count) {
     xi_dev_list.devices.reset(
         XIQueryDevice(display, XIAllDevices, &xi_dev_list.count));
   }
   return xi_dev_list;
 }
 
 }  // namespace ui