remove memoryinstrumentation

Source/core/css/DocumentRuleSets.h

Index: Source/core/css/DocumentRuleSets.h
diff --git a/Source/core/css/DocumentRuleSets.h b/Source/core/css/DocumentRuleSets.h
index a4b7198694e53405281a1394d0491b207631b871..839545b7ee3649ce7d48a0d6eb6e8ba43a295d73 100644
--- a/Source/core/css/DocumentRuleSets.h
+++ b/Source/core/css/DocumentRuleSets.h
@@ -47,7 +47,6 @@ public:
     void collectMatchRequests(bool includeEmptyRules, Vector<MatchRequest>&);
     void clear() { m_shadowDistributedRuleSetMap.clear(); }
     bool isEmpty() const { return m_shadowDistributedRuleSetMap.isEmpty(); }
-    void reportMemoryUsage(MemoryObjectInfo*) const;
 private:
     typedef HashMap<const ContainerNode*, OwnPtr<RuleSet> > ShadowDistributedRuleSetMap;
     ShadowDistributedRuleSetMap m_shadowDistributedRuleSetMap;
@@ -69,7 +68,6 @@ public:
     void appendAuthorStyleSheets(unsigned firstNew, const Vector<RefPtr<CSSStyleSheet> >&, MediaQueryEvaluator*, InspectorCSSOMWrappers&, bool isViewSource, StyleResolver*);
 
     void collectFeatures(bool isViewSource, StyleScopeResolver*);
-    void reportMemoryUsage(MemoryObjectInfo*) const;
     ShadowDistributedRules& shadowDistributedRules() { return m_shadowDistributedRules; }
 
 private: