Move Singleton and related structs to namespace base

chrome/browser/performance_monitor/performance_monitor.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/performance_monitor/performance_monitor.h"
 
 #include "base/memory/singleton.h"
 #include "base/process/process_iterator.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 23 matching lines @@
 namespace performance_monitor {
 
 PerformanceMonitor::PerformanceMonitor() {
 }
 
 PerformanceMonitor::~PerformanceMonitor() {
 }
 
 // static
 PerformanceMonitor* PerformanceMonitor::GetInstance() {
-  return Singleton<PerformanceMonitor>::get();
+  return base::Singleton<PerformanceMonitor>::get();
 }
 
 void PerformanceMonitor::StartGatherCycle() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   repeating_timer_.Start(FROM_HERE,
                          base::TimeDelta::FromSeconds(kGatherIntervalInSeconds),
                          this, &PerformanceMonitor::GatherMetricsMapOnUIThread);
 }
 
 namespace {
@@ skipping 153 matching lines @@
 void PerformanceMonitor::RunTriggersUIThread() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   for (auto it = metrics_map_.begin(); it != metrics_map_.end(); ++it) {
     it->second.RunPerformanceTriggers();
   }
 
   StartGatherCycle();
 }
 
 }  // namespace performance_monitor