Oilpan: Reduce FIXME(OILPAN) from the code base

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 b702c7747c3ec118d905c1e0e76871df8400e922..945f476e7e5b25a25e34162a64688be4570b6d9e 100644
--- a/Source/core/css/ElementRuleCollector.h
+++ b/Source/core/css/ElementRuleCollector.h
@@ -62,11 +62,7 @@ public:
     }
 
 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;
+    RawPtrWillBeMember<const RuleData> m_ruleData;

[sof, 2015/09/02 14:46:36]

Needs to be additionally trace()d.

     unsigned m_specificity;
     uint64_t m_position;
     RawPtrWillBeMember<const CSSStyleSheet> m_parentStyleSheet;