Improve some naming

ui/base/default_theme_provider.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 "ui/base/default_theme_provider.h"
 
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace ui {
 
 DefaultThemeProvider::DefaultThemeProvider() {}
 
 DefaultThemeProvider::~DefaultThemeProvider() {}
 
-bool DefaultThemeProvider::UsingNativeTheme() const {
+bool DefaultThemeProvider::UsingSystemTheme() const {
   return true;
 }
 
 gfx::ImageSkia* DefaultThemeProvider::GetImageSkiaNamed(int id) const {
   return ResourceBundle::GetSharedInstance().GetImageSkiaNamed(id);
 }
 
 SkColor DefaultThemeProvider::GetColor(int id) const {
   // Return debugging-blue.
   return 0xff0000ff;
@@ skipping 11 matching lines @@
   return false;
 }
 
 base::RefCountedMemory* DefaultThemeProvider::GetRawData(
     int id,
     ui::ScaleFactor scale_factor) const {
   return NULL;
 }
 
 }  // namespace ui