Move Singleton and related structs to namespace base

chrome/browser/mac/mac_startup_profiler.cc

 // Copyright 2014 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/mac/mac_startup_profiler.h"
 
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "components/startup_metric_utils/startup_metric_utils.h"
 
 // static
 MacStartupProfiler* MacStartupProfiler::GetInstance() {
-  return Singleton<MacStartupProfiler>::get();
+  return base::Singleton<MacStartupProfiler>::get();
 }
 
 MacStartupProfiler::MacStartupProfiler() : recorded_metrics_(false) {
 }
 
 MacStartupProfiler::~MacStartupProfiler() {
 }
 
 void MacStartupProfiler::Profile(Location location) {
   profiled_times_[location] = base::Time::Now();
@@ skipping 47 matching lines @@
   // method will be the first and only usage of a histogram with that given
   // name.
   base::HistogramBase* histogram = base::Histogram::FactoryTimeGet(
       name,
       min,
       max,
       bucket_count,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   histogram->AddTime(delta);
 }