Move Singleton and related structs to namespace base

chrome/browser/chromeos/events/xinput_hierarchy_changed_event_listener.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/chromeos/events/xinput_hierarchy_changed_event_listener.h"
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
 
 #include "ui/base/ime/chromeos/ime_keyboard.h"
@@ skipping 26 matching lines @@
     keyboard->ReapplyCurrentModifierLockStatus();
     keyboard->ReapplyCurrentKeyboardLayout();
   }
 }
 
 }  // namespace
 
 // static
 XInputHierarchyChangedEventListener*
 XInputHierarchyChangedEventListener::GetInstance() {
-  return Singleton<XInputHierarchyChangedEventListener>::get();
+  return base::Singleton<XInputHierarchyChangedEventListener>::get();
 }
 
 XInputHierarchyChangedEventListener::XInputHierarchyChangedEventListener()
     : stopped_(false) {
   ui::PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
 }
 
 XInputHierarchyChangedEventListener::~XInputHierarchyChangedEventListener() {
   Stop();
 }
@@ skipping 21 matching lines @@
 
   XGenericEventCookie* cookie = &(xevent->xcookie);
 
   if (cookie->evtype == XI_HierarchyChanged) {
     XIHierarchyEvent* event = static_cast<XIHierarchyEvent*>(cookie->data);
     HandleHierarchyChangedEvent(event);
   }
 }
 
 }  // namespace chromeos