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

Source/core/css/resolver/StyleAdjuster.h

Index: Source/core/css/resolver/StyleAdjuster.h
diff --git a/Source/core/css/resolver/StyleAdjuster.h b/Source/core/css/resolver/StyleAdjuster.h
index d578ba2a9f730b9d0b20b902a50358588ed6b1d9..cb771f277b18bd3dbd25b7c2615c4307950f0c12 100644
--- a/Source/core/css/resolver/StyleAdjuster.h
+++ b/Source/core/css/resolver/StyleAdjuster.h
@@ -26,10 +26,10 @@
 
 namespace blink {
 
-class CachedUAStyle;
 class Element;
 class HTMLElement;
 class RenderStyle;
+class UAStyleChange;
 
 // Certain CSS Properties/Values do not apply to certain elements
 // and the web expects that we expose "adjusted" values when
@@ -41,7 +41,7 @@ public:
         : m_useQuirksModeStyles(useQuirksModeStyles)
     { }
 
-    void adjustRenderStyle(RenderStyle* styleToAdjust, RenderStyle* parentStyle, Element*, const CachedUAStyle*);
+    void adjustRenderStyle(RenderStyle* styleToAdjust, RenderStyle* parentStyle, Element*, const UAStyleChange&);
 
 private:
     void adjustStyleForFirstLetter(RenderStyle*);