[wip] simplify -webkit-appearance adjust step

Source/core/css/resolver/StyleResolverState.h

Index: Source/core/css/resolver/StyleResolverState.h
diff --git a/Source/core/css/resolver/StyleResolverState.h b/Source/core/css/resolver/StyleResolverState.h
index 9918765ff51d8ac095341f0bf774049922119b54..01b758d91f487afa89c95628b0885efda663c46e 100644
--- a/Source/core/css/resolver/StyleResolverState.h
+++ b/Source/core/css/resolver/StyleResolverState.h
@@ -32,7 +32,6 @@
 #include "core/css/resolver/FontBuilder.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
-#include "core/rendering/style/CachedUAStyle.h"
 #include "core/rendering/style/RenderStyle.h"
 #include "core/rendering/style/StyleInheritedData.h"
 
@@ -89,20 +88,8 @@ public:
     // Holds all attribute names found while applying "content" properties that contain an "attr()" value.
     Vector<AtomicString>& contentAttrValues() { return m_contentAttrValues; }
 
-    void cacheUserAgentBorderAndBackground()
-    {
-        // RenderTheme only needs the cached style if it has an appearance,
-        // and constructing it is expensive so we avoid it if possible.
-        if (!style()->hasAppearance())
-            return;
-
-        m_cachedUAStyle = CachedUAStyle::create(style());
-    }
-
-    const CachedUAStyle* cachedUAStyle() const
-    {
-        return m_cachedUAStyle.get();
-    }
+    void setValuesUnchangedForWebkitAppearance() { m_valuesUnchangedForWebkitAppearance = true; }
+    bool valuesUnchangedForWebkitAppearance() { return m_valuesUnchangedForWebkitAppearance; }
 
     ElementStyleResources& elementStyleResources() { return m_elementStyleResources; }
     const CSSToStyleMap& styleMap() const { return m_styleMap; }
@@ -148,7 +135,7 @@ private:
 
     FontBuilder m_fontBuilder;
 
-    OwnPtr<CachedUAStyle> m_cachedUAStyle;
+    bool m_valuesUnchangedForWebkitAppearance;
 
     ElementStyleResources m_elementStyleResources;
     // CSSToStyleMap is a pure-logic class and only contains