Let StyleResolver figure out differences between UA style and resolved style.

Source/core/layout/LayoutThemeChromiumMac.h

 /*
  * This file is part of the theme implementation for form controls in WebCore.
  *
  * Copyright (C) 2005 Apple Computer, Inc.
  * 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.
@@ skipping 20 matching lines @@
 OBJC_CLASS LayoutThemeNotificationObserver;
 
 namespace blink {
 
 class LayoutThemeChromiumMac final : public LayoutTheme {
 public:
     static PassRefPtr<LayoutTheme> create();
 
     virtual void adjustPaintInvalidationRect(const RenderObject*, IntRect&) override;
 
-    virtual bool isControlStyled(const RenderStyle*, const CachedUAStyle*) const override;
+    virtual bool isControlStyled(const RenderStyle*, const UAStyleChange&) const override;
 
     virtual Color platformActiveSelectionBackgroundColor() const override;
     virtual Color platformInactiveSelectionBackgroundColor() const override;
     virtual Color platformActiveSelectionForegroundColor() const override;
     virtual Color platformActiveListBoxSelectionBackgroundColor() const override;
     virtual Color platformActiveListBoxSelectionForegroundColor() const override;
     virtual Color platformInactiveListBoxSelectionBackgroundColor() const override;
     virtual Color platformInactiveListBoxSelectionForegroundColor() const override;
     virtual Color platformFocusRingColor() const override;
 
@@ skipping 148 matching lines @@
     mutable RetainPtr<NSTextFieldCell> m_textField;
 
     mutable HashMap<int, RGBA32> m_systemColorCache;
 
     RetainPtr<LayoutThemeNotificationObserver> m_notificationObserver;
 };
 
 } // namespace blink
 
 #endif // LayoutThemeChromiumMac_h