Remove the remaining parts of ignorePendingStylesheets and placeholder styles.

sky/engine/core/css/resolver/StyleResolver.h

Index: sky/engine/core/css/resolver/StyleResolver.h
diff --git a/sky/engine/core/css/resolver/StyleResolver.h b/sky/engine/core/css/resolver/StyleResolver.h
index 5937cffd7160daddf8e799de6c346eeaa94ee624..32d2387e31ed6896cfaa60a601ee7a3f3d1574be 100644
--- a/sky/engine/core/css/resolver/StyleResolver.h
+++ b/sky/engine/core/css/resolver/StyleResolver.h
@@ -139,9 +139,6 @@ public:
 
     void notifyResizeForViewportUnits();
 
-    // Exposed for RenderStyle::isStyleAvilable().
-    static RenderStyle* styleNotYetAvailable() { return s_styleNotYetAvailable; }
-
     RuleFeatureSet& ensureUpdatedRuleFeatureSet()
     {
         if (hasPendingAuthorStyleSheets())
@@ -218,8 +215,6 @@ private:
     typedef HashMap<StringImpl*, RefPtr<StyleRuleKeyframes> > KeyframesRuleMap;
     KeyframesRuleMap m_keyframesRuleMap;
 
-    static RenderStyle* s_styleNotYetAvailable;
-
     MatchedPropertiesCache m_matchedPropertiesCache;
 
     OwnPtr<MediaQueryEvaluator> m_medium;