Move Singleton and related structs to namespace base

components/tracing/child_memory_dump_manager_delegate_impl.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 "components/tracing/child_memory_dump_manager_delegate_impl.h"
 
 #include "base/single_thread_task_runner.h"
 #include "components/tracing/child_trace_message_filter.h"
 
 namespace tracing {
 
 // static
 ChildMemoryDumpManagerDelegateImpl*
 ChildMemoryDumpManagerDelegateImpl::GetInstance() {
-  return Singleton<
+  return base::Singleton<
       ChildMemoryDumpManagerDelegateImpl,
-      LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
+      base::LeakySingletonTraits<ChildMemoryDumpManagerDelegateImpl>>::get();
 }
 
 ChildMemoryDumpManagerDelegateImpl::ChildMemoryDumpManagerDelegateImpl()
     : ctmf_(nullptr),
       tracing_process_id_(
           base::trace_event::MemoryDumpManager::kInvalidTracingProcessId) {
   base::trace_event::MemoryDumpManager::GetInstance()->SetDelegate(this);
 }
 
 ChildMemoryDumpManagerDelegateImpl::~ChildMemoryDumpManagerDelegateImpl() {
@@ skipping 44 matching lines @@
 
 bool ChildMemoryDumpManagerDelegateImpl::IsCoordinatorProcess() const {
   return false;
 }
 
 uint64 ChildMemoryDumpManagerDelegateImpl::GetTracingProcessId() const {
   return tracing_process_id_;
 }
 
 }  // namespace tracing