Move Singleton and related structs to namespace base

content/browser/histogram_controller.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 "content/browser/histogram_controller.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process_handle.h"
 #include "content/browser/histogram_subscriber.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/browser/browser_child_process_host_iterator.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/child_process_data.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/process_type.h"
 
 namespace content {
 
 HistogramController* HistogramController::GetInstance() {
-  return Singleton<HistogramController>::get();
+  return base::Singleton<HistogramController>::get();
 }
 
 HistogramController::HistogramController() : subscriber_(NULL) {
 }
 
 HistogramController::~HistogramController() {
 }
 
 void HistogramController::OnPendingProcesses(int sequence_number,
                                              int pending_processes,
@@ skipping 89 matching lines @@
 
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&HistogramController::GetHistogramDataFromChildProcesses,
                  base::Unretained(this),
                  sequence_number));
 }
 
 }  // namespace content