Move Singleton and related structs to namespace base

chrome/browser/ui/aura/accessibility/automation_manager_aura.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_
 #define CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/extensions/api/automation_internal/automation_action_adapter.h"
 #include "chrome/browser/ui/aura/accessibility/ax_tree_source_aura.h"
 #include "ui/accessibility/ax_tree_serializer.h"
 #include "ui/views/focus/widget_focus_manager.h"
 
+namespace base {
 template <typename T>
 struct DefaultSingletonTraits;
+}  // namespace base
 
 namespace content {
 class BrowserContext;
 }  // namespace content
 
 namespace views {
 class AXAuraObjWrapper;
 class View;
 }  // namespace views
 
@@ skipping 24 matching lines @@
   void DoDefault(int32 id) override;
   void Focus(int32 id) override;
   void MakeVisible(int32 id) override;
   void SetSelection(int32 id, int32 start, int32 end) override;
   void ShowContextMenu(int32 id) override;
 
  protected:
   ~AutomationManagerAura() override;
 
  private:
-  friend struct DefaultSingletonTraits<AutomationManagerAura>;
+  friend struct base::DefaultSingletonTraits<AutomationManagerAura>;
 
   AutomationManagerAura();
 
   // Reset all state in this manager.
   void ResetSerializer();
 
   void SendEvent(content::BrowserContext* context,
                  views::AXAuraObjWrapper* aura_obj,
                  ui::AXEvent event_type);
 
@@ skipping 15 matching lines @@
   bool processing_events_;
 
   std::vector<std::pair<views::AXAuraObjWrapper*, ui::AXEvent>> pending_events_;
 
   aura::Window* focused_window_;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationManagerAura);
 };
 
 #endif  // CHROME_BROWSER_UI_AURA_ACCESSIBILITY_AUTOMATION_MANAGER_AURA_H_