Switch to LayoutThemeMobile when emulating mobile device in DevTools.

third_party/WebKit/Source/core/layout/LayoutThemeLinux.cpp

 // 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.
 
 #include "core/layout/LayoutThemeLinux.h"
 
 #include "platform/PlatformResourceLoader.h"
 
 namespace blink {
 
 PassRefPtr<LayoutTheme> LayoutThemeLinux::create()
 {
     return adoptRef(new LayoutThemeLinux());
 }
 
-LayoutTheme& LayoutTheme::theme()
+LayoutTheme& LayoutTheme::nativeTheme()
 {
     DEFINE_STATIC_REF(LayoutTheme, layoutTheme, (LayoutThemeLinux::create()));
     return *layoutTheme;
 }
 
 String LayoutThemeLinux::extraDefaultStyleSheet()
 {
     return LayoutThemeDefault::extraDefaultStyleSheet() +
         loadResourceAsASCIIString("themeChromiumLinux.css");
 }
 
 } // namespace blink