Move Singleton and related structs to namespace base

extensions/browser/extension_function_registry.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 "extensions/browser/extension_function_registry.h"
 
 #include "base/memory/singleton.h"
 #include "extensions/browser/extension_function.h"
 #include "extensions/browser/extensions_browser_client.h"
 
 // static
 ExtensionFunctionRegistry* ExtensionFunctionRegistry::GetInstance() {
-  return Singleton<ExtensionFunctionRegistry>::get();
+  return base::Singleton<ExtensionFunctionRegistry>::get();
 }
 
 ExtensionFunctionRegistry::ExtensionFunctionRegistry() {
   extensions::ExtensionsBrowserClient* client =
       extensions::ExtensionsBrowserClient::Get();
   if (client) {
     client->RegisterExtensionFunctions(this);
   }
 }
 
@@ skipping 30 matching lines @@
 }
 
 ExtensionFunctionRegistry::FactoryEntry::FactoryEntry(
     ExtensionFunctionFactory factory,
     const char* function_name,
     extensions::functions::HistogramValue histogram_value)
     : factory_(factory),
       function_name_(function_name),
       histogram_value_(histogram_value) {
 }