Remove unused Mac platform code.

Source/core/rendering/RenderThemeChromiumMac.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 198 matching lines @@
     return Color::white;
 }
 
 Color RenderThemeChromiumMac::platformInactiveListBoxSelectionForegroundColor() const
 {
     return Color::black;
 }
 
 Color RenderThemeChromiumMac::platformFocusRingColor() const
 {
+    static const RGBA32 oldAquaFocusRingColor = 0xFF7DADD9;
     if (usesTestModeFocusRingColor())
-        return oldAquaFocusRingColor();
+        return oldAquaFocusRingColor;
 
     return systemColor(CSSValueWebkitFocusRingColor);
 }
 
 Color RenderThemeChromiumMac::platformInactiveListBoxSelectionBackgroundColor() const
 {
     return platformInactiveSelectionBackgroundColor();
 }
 
 static FontWeight toFontWeight(NSInteger appKitFontWeight)
@@ skipping 1672 matching lines @@
 
 bool RenderThemeChromiumMac::shouldUseFallbackTheme(RenderStyle* style) const
 {
     ControlPart part = style->appearance();
     if (part == CheckboxPart || part == RadioPart)
         return style->effectiveZoom() != 1;
     return false;
 }
 
 } // namespace WebCore