Oilpan: Reapply: Remove all the RefPtrs and most of the raw pointers to style

Source/core/css/ElementRuleCollector.h

Index: Source/core/css/ElementRuleCollector.h
diff --git a/Source/core/css/ElementRuleCollector.h b/Source/core/css/ElementRuleCollector.h
index 5c169b6eb907a4c1834a2013e6f483f9e6f22125..cea335216560302f751e6bac43dede954c4d5d67 100644
--- a/Source/core/css/ElementRuleCollector.h
+++ b/Source/core/css/ElementRuleCollector.h
@@ -47,9 +47,9 @@ const CascadeScope ignoreCascadeScope = 0;
 const CascadeOrder ignoreCascadeOrder = 0;
 
 class MatchedRule {
-    WTF_MAKE_FAST_ALLOCATED;
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
-    explicit MatchedRule(const RuleData* ruleData, unsigned specificity, CascadeScope cascadeScope, CascadeOrder cascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet)
+    MatchedRule(const RuleData* ruleData, unsigned specificity, CascadeScope cascadeScope, CascadeOrder cascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet)
         : m_ruleData(ruleData)
         , m_specificity(specificity)
         , m_cascadeScope(cascadeScope)
@@ -66,15 +66,37 @@ public:
     uint64_t position() const { return m_position; }
     unsigned specificity() const { return ruleData()->specificity() + m_specificity; }
     const CSSStyleSheet* parentStyleSheet() const { return m_parentStyleSheet; }
+    void trace(Visitor* visitor)
+    {
+        visitor->trace(m_parentStyleSheet);
+    }
 
 private:
+    // FIXME: Oilpan: RuleData is in the oilpan heap and this pointer
+    // really should be traced. However, RuleData objects are
+    // allocated inside larger TerminatedArray objects and we cannot
+    // trace a raw rule data pointer at this point.
     const RuleData* m_ruleData;
     unsigned m_specificity;
     CascadeScope m_cascadeScope;
     uint64_t m_position;
-    const CSSStyleSheet* m_parentStyleSheet;
+    RawPtrWillBeMember<const CSSStyleSheet> m_parentStyleSheet;
 };
 
+} // namespace WebCore
+
+
+namespace WTF {
+
+template <> struct VectorTraits<WebCore::MatchedRule> : VectorTraitsBase<WebCore::MatchedRule> {
+    static const bool canInitializeWithMemset = true;
+    static const bool canMoveWithMemcpy = true;
+};
+
+} // namespace WTF
+
+namespace WebCore {
+
 // FIXME: oilpan: when transition types are gone this class can be replaced with HeapVector.
 class StyleRuleList : public RefCounted<StyleRuleList> {
 public:
@@ -150,7 +172,7 @@ private:
     bool m_sameOriginOnly;
     bool m_matchingUARules;
 
-    OwnPtr<Vector<MatchedRule, 32> > m_matchedRules;
+    OwnPtrWillBeMember<WillBeHeapVector<MatchedRule, 32> > m_matchedRules;
 
     // Output.
     RefPtrWillBeMember<StaticCSSRuleList> m_cssRuleList;