Move Singleton and related structs to namespace base

chrome/browser/extensions/api/notifications/notifications_api.cc

 // Copyright (c) 2012 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/extensions/api/notifications/notifications_api.h"
 
 #include "base/callback.h"
 #include "base/guid.h"
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 88 matching lines @@
   const gfx::ImageSkia masked_small_image =
       gfx::ImageSkiaOperations::CreateMaskedImage(foreground, small_image);
   return gfx::Image(gfx::ImageSkiaOperations::CreateSuperimposedImage(
       background, masked_small_image));
 }
 
 class ShutdownNotifierFactory
     : public BrowserContextKeyedServiceShutdownNotifierFactory {
  public:
   static ShutdownNotifierFactory* GetInstance() {
-    return Singleton<ShutdownNotifierFactory>::get();
+    return base::Singleton<ShutdownNotifierFactory>::get();
   }
 
  private:
-  friend struct DefaultSingletonTraits<ShutdownNotifierFactory>;
+  friend struct base::DefaultSingletonTraits<ShutdownNotifierFactory>;
 
   ShutdownNotifierFactory()
       : BrowserContextKeyedServiceShutdownNotifierFactory(
             "NotificationsApiDelegate") {
     DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
   }
   ~ShutdownNotifierFactory() override {}
 
   DISALLOW_COPY_AND_ASSIGN(ShutdownNotifierFactory);
 };
@@ skipping 556 matching lines @@
           ? api::notifications::PERMISSION_LEVEL_GRANTED
           : api::notifications::PERMISSION_LEVEL_DENIED;
 
   SetResult(new base::StringValue(api::notifications::ToString(result)));
   SendResponse(true);
 
   return true;
 }
 
 }  // namespace extensions