Move Singleton and related structs to namespace base

content/browser/in_process_io_surface_manager_mac.cc

 // Copyright 2015 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 "content/browser/in_process_io_surface_manager_mac.h"
 
 #include "base/logging.h"
 
 namespace content {
 
 // static
 InProcessIOSurfaceManager* InProcessIOSurfaceManager::GetInstance() {
-  return Singleton<InProcessIOSurfaceManager,
-                   LeakySingletonTraits<InProcessIOSurfaceManager>>::get();
+  return base::Singleton<
+      InProcessIOSurfaceManager,
+      base::LeakySingletonTraits<InProcessIOSurfaceManager>>::get();
 }
 
 bool InProcessIOSurfaceManager::RegisterIOSurface(IOSurfaceId io_surface_id,
                                                   int client_id,
                                                   IOSurfaceRef io_surface) {
   base::AutoLock lock(lock_);
 
   DCHECK(io_surfaces_.find(io_surface_id) == io_surfaces_.end());
   io_surfaces_.add(io_surface_id,
                    make_scoped_ptr(new base::mac::ScopedMachSendRight(
@@ skipping 17 matching lines @@
   return IOSurfaceLookupFromMachPort(io_surfaces_.get(io_surface_id)->get());
 }
 
 InProcessIOSurfaceManager::InProcessIOSurfaceManager() {
 }
 
 InProcessIOSurfaceManager::~InProcessIOSurfaceManager() {
 }
 
 }  // namespace content