Move Singleton and related structs to namespace base

content/browser/tracing/etw_system_event_consumer_win.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 "content/browser/tracing/etw_system_event_consumer_win.h"
 
 #include "base/base64.h"
 #include "base/json/json_string_value_serializer.h"
 #include "base/lazy_instance.h"
 #include "base/memory/singleton.h"
@@ skipping 111 matching lines @@
 }
 
 bool EtwSystemEventConsumer::StopKernelSessionTracing() {
   HRESULT hr = base::win::EtwTraceController::Stop(
       KERNEL_LOGGER_NAME, &properties_);
   return SUCCEEDED(hr);
 }
 
 // static
 EtwSystemEventConsumer* EtwSystemEventConsumer::GetInstance() {
-  return Singleton<EtwSystemEventConsumer>::get();
+  return base::Singleton<EtwSystemEventConsumer>::get();
 }
 
 // static
 void EtwSystemEventConsumer::ProcessEvent(EVENT_TRACE* event) {
   EtwSystemEventConsumer::GetInstance()->AppendEventToBuffer(event);
 }
 
 void EtwSystemEventConsumer::AddSyncEventToBuffer() {
   // Sync the clocks.
   base::Time walltime = base::Time::NowFromSystemTime();
@@ skipping 80 matching lines @@
   serializer.Serialize(*header.get());
 
   // Pass the result to the UI Thread.
   scoped_refptr<base::RefCountedString> result =
       base::RefCountedString::TakeString(&output);
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
                           base::Bind(callback, result));
 }
 
 }  // namespace content