Move Singleton and related structs to namespace base

base/trace_event/trace_event_etw_export_win.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 "base/trace_event/trace_event_etw_export_win.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_tokenizer.h"
@@ skipping 172 matching lines @@
   categories_status_[kDisabledOtherEventsGroupName] = false;
   DCHECK_EQ(kNumberOfCategories, categories_status_.size());
 }
 
 TraceEventETWExport::~TraceEventETWExport() {
   EventUnregisterChrome();
 }
 
 // static
 TraceEventETWExport* TraceEventETWExport::GetInstance() {
-  return Singleton<TraceEventETWExport,
-                   StaticMemorySingletonTraits<TraceEventETWExport>>::get();
+  return base::Singleton<TraceEventETWExport, base::StaticMemorySingletonTraits<
+                                                  TraceEventETWExport>>::get();
 }
 
 // static
 void TraceEventETWExport::EnableETWExport() {
   auto* instance = GetInstance();
   if (instance && !instance->etw_export_enabled_) {
     instance->etw_export_enabled_ = true;
     // Sync the enabled categories with ETW by calling UpdateEnabledCategories()
     // that checks the keyword. Then create a thread that will call that same
     // function periodically, to make sure we stay in sync.
@@ skipping 230 matching lines @@
 // static
 void TraceEventETWExport::UpdateETWKeyword() {
   if (!IsETWExportEnabled())
     return;
   auto* instance = GetInstance();
   DCHECK(instance);
   instance->UpdateEnabledCategories();
 }
 }  // namespace trace_event
 }  // namespace base