Move Singleton and related structs to namespace base

ui/views/accessibility/native_view_accessibility_auralinux.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 "ui/views/accessibility/native_view_accessibility_auralinux.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/memory/singleton.h"
@@ skipping 15 matching lines @@
 // AXPlatformNodeDelegate interface so we can create such an application
 // object. Every time we create an accessibility object for a View, we add its
 // top-level widget to a vector so we can return the list of all top-level
 // windows as children of this application object.
 class AuraLinuxApplication
     : public ui::AXPlatformNodeDelegate,
       public WidgetObserver {
  public:
   // Get the single instance of this class.
   static AuraLinuxApplication* GetInstance() {
-    return Singleton<AuraLinuxApplication>::get();
+    return base::Singleton<AuraLinuxApplication>::get();
   }
 
   // Called every time we create a new accessibility on a View.
   // Add the top-level widget to our registry so that we can enumerate all
   // top-level widgets.
   void RegisterWidget(Widget* widget) {
     if (!widget)
       return;
 
     widget = widget->GetTopLevelWidget();
@@ skipping 60 matching lines @@
   }
 
   void DoDefaultAction() override {
   }
 
   bool SetStringValue(const base::string16& new_value) override {
     return false;
   }
 
  private:
-  friend struct DefaultSingletonTraits<AuraLinuxApplication>;
+  friend struct base::DefaultSingletonTraits<AuraLinuxApplication>;
 
   AuraLinuxApplication()
       : platform_node_(ui::AXPlatformNode::Create(this)) {
     data_.role = ui::AX_ROLE_APPLICATION;
     if (ViewsDelegate::GetInstance()) {
       data_.AddStringAttribute(
           ui::AX_ATTR_NAME,
           ViewsDelegate::GetInstance()->GetApplicationName());
     }
     ui::AXPlatformNodeAuraLinux::SetApplication(platform_node_);
@@ skipping 35 matching lines @@
 }
 
 gfx::NativeViewAccessible NativeViewAccessibilityAuraLinux::GetParent() {
   gfx::NativeViewAccessible parent = NativeViewAccessibility::GetParent();
   if (!parent)
     parent = AuraLinuxApplication::GetInstance()->GetNativeViewAccessible();
   return parent;
 }
 
 }  // namespace views