Improve some naming

chrome/browser/ui/extensions/extension_install_ui_default.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 CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_INSTALL_UI_DEFAULT_H_
 #define CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_INSTALL_UI_DEFAULT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 
 class Profile;
 
 class ExtensionInstallUIDefault : public ExtensionInstallUI {
  public:
   explicit ExtensionInstallUIDefault(Profile* profile);
   virtual ~ExtensionInstallUIDefault();
 
   // ExtensionInstallUI:
   virtual void OnInstallSuccess(const extensions::Extension* extension,
                                 SkBitmap* icon) OVERRIDE;
   virtual void OnInstallFailure(
       const extensions::CrxInstallerError& error) OVERRIDE;
   virtual void SetUseAppInstalledBubble(bool use_bubble) OVERRIDE;
 
  private:
   // Used to undo theme installation.
   std::string previous_theme_id_;
-  bool previous_using_native_theme_;
+  bool previous_using_system_theme_;
 
   // Whether to show an installed bubble on app install, or use the default
   // action of opening a new tab page.
   bool use_app_installed_bubble_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(ExtensionInstallUIDefault);
 };
 
 #endif  // CHROME_BROWSER_UI_EXTENSIONS_EXTENSION_INSTALL_UI_DEFAULT_H_