[Oilpan] Unify memory usage reporters of Oilpan

third_party/WebKit/Source/core/html/CollectionItemsCache.h

Index: third_party/WebKit/Source/core/html/CollectionItemsCache.h
diff --git a/third_party/WebKit/Source/core/html/CollectionItemsCache.h b/third_party/WebKit/Source/core/html/CollectionItemsCache.h
index f288ce7990c8e6bba835bf8e4b4b4b559cd28b21..b1fe8b70622b04b36c4ccb7e287cde52b678d1c8 100644
--- a/third_party/WebKit/Source/core/html/CollectionItemsCache.h
+++ b/third_party/WebKit/Source/core/html/CollectionItemsCache.h
@@ -59,12 +59,6 @@ public:
     void invalidate();
 
 private:
-    ptrdiff_t allocationSize() const { return m_cachedList.capacity() * sizeof(NodeType*); }
-    static void reportExtraMemoryCostForCollectionItemsCache(ptrdiff_t diff)
-    {
-        v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(diff);
-    }
-
     bool m_listValid;
     WillBeHeapVector<RawPtrWillBeMember<NodeType>> m_cachedList;
 };
@@ -78,8 +72,6 @@ CollectionItemsCache<Collection, NodeType>::CollectionItemsCache()
 template <typename Collection, typename NodeType>
 CollectionItemsCache<Collection, NodeType>::~CollectionItemsCache()
 {
-    if (ptrdiff_t diff = allocationSize())
-        reportExtraMemoryCostForCollectionItemsCache(-diff);
 }
 
 template <typename Collection, typename NodeType>
@@ -100,13 +92,10 @@ unsigned CollectionItemsCache<Collection, NodeType>::nodeCount(const Collection&
 
     NodeType* currentNode = collection.traverseToFirst();
     unsigned currentIndex = 0;
-    ptrdiff_t oldCapacity = allocationSize();
     while (currentNode) {
         m_cachedList.append(currentNode);
         currentNode = collection.traverseForwardToOffset(currentIndex + 1, *currentNode, currentIndex);
     }
-    if (ptrdiff_t diff = allocationSize() - oldCapacity)
-        reportExtraMemoryCostForCollectionItemsCache(diff);
 
     this->setCachedNodeCount(m_cachedList.size());
     m_listValid = true;