Switch to LayoutThemeMobile when emulating mobile device in DevTools.

third_party/WebKit/Source/core/layout/LayoutThemeMac.mm

 /*
  * Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Google, Inc.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 1084 matching lines @@
 
     return StringTruncator::centerTruncate(strToTruncate, width, font);
 }
 
 NSView* FlippedView()
 {
     static NSView* view = [[BlinkFlippedView alloc] init];
     return view;
 }
 
-LayoutTheme& LayoutTheme::theme()
+LayoutTheme& LayoutTheme::nativeTheme()
 {
     DEFINE_STATIC_REF(LayoutTheme, layoutTheme, (LayoutThemeMac::create()));
     return *layoutTheme;
 }
 
 PassRefPtr<LayoutTheme> LayoutThemeMac::create()
 {
     return adoptRef(new LayoutThemeMac);
 }
 
@@ skipping 51 matching lines @@
 
 bool LayoutThemeMac::shouldUseFallbackTheme(const ComputedStyle& style) const
 {
     ControlPart part = style.appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style.effectiveZoom() != 1;
     return false;
 }
 
 } // namespace blink