Improve some naming

ui/base/default_theme_provider.h

 // 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.
 
 #ifndef UI_BASE_DEFAULT_THEME_PROVIDER_H_
 #define UI_BASE_DEFAULT_THEME_PROVIDER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/base/theme_provider.h"
 #include "ui/base/ui_base_export.h"
 
 namespace ui {
 class ResourceBundle;
 }
 
 namespace ui {
 
 class UI_BASE_EXPORT DefaultThemeProvider : public ThemeProvider {
  public:
   DefaultThemeProvider();
   virtual ~DefaultThemeProvider();
 
   // Overridden from ui::ThemeProvider:
-  virtual bool UsingNativeTheme() const OVERRIDE;
+  virtual bool UsingSystemTheme() const OVERRIDE;
   virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const OVERRIDE;
   virtual SkColor GetColor(int id) const OVERRIDE;
   virtual int GetDisplayProperty(int id) const OVERRIDE;
   virtual bool ShouldUseNativeFrame() const OVERRIDE;
   virtual bool HasCustomImage(int id) const OVERRIDE;
   virtual base::RefCountedMemory* GetRawData(
       int id,
       ui::ScaleFactor scale_factor) const OVERRIDE;
 
 #if defined(OS_MACOSX) && !defined(TOOLKIT_VIEWS)
   virtual NSImage* GetNSImageNamed(int id) const OVERRIDE;
   virtual NSColor* GetNSImageColorNamed(int id) const OVERRIDE;
   virtual NSColor* GetNSColor(int id) const OVERRIDE;
   virtual NSColor* GetNSColorTint(int id) const OVERRIDE;
   virtual NSGradient* GetNSGradient(int id) const OVERRIDE;
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DefaultThemeProvider);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DEFAULT_THEME_PROVIDER_H_