Oilpan: fix Windows build after r187674.

Source/platform/heap/Handle.h

Index: Source/platform/heap/Handle.h
diff --git a/Source/platform/heap/Handle.h b/Source/platform/heap/Handle.h
index d1caccc48f349bec642a959863dbe8ee1ef4e86f..e2f2210164084f4416b563111b21893154528faf 100644
--- a/Source/platform/heap/Handle.h
+++ b/Source/platform/heap/Handle.h
@@ -1139,16 +1139,6 @@ template<typename T> struct DefaultHash<blink::Persistent<T>> {
     using Hash = PtrHash<blink::Persistent<T>>;
 };
 
-template<typename T>
-struct NeedsTracing<blink::Member<T>> {
-    static const bool value = true;
-};
-
-template<typename T>
-struct IsWeak<blink::WeakMember<T>> {
-    static const bool value = true;
-};
-
 template<typename T> inline T* getPtr(const blink::Member<T>& p)
 {
     return p.get();
@@ -1159,14 +1149,6 @@ template<typename T> inline T* getPtr(const blink::Persistent<T>& p)
     return p.get();
 }
 
-template<typename T, size_t inlineCapacity>
-struct NeedsTracing<ListHashSetNode<T, blink::HeapListHashSetAllocator<T, inlineCapacity>> *> {
-    // All heap allocated node pointers need visiting to keep the nodes alive,
-    // regardless of whether they contain pointers to other heap allocated
-    // objects.
-    static const bool value = true;
-};
-
 // For wtf/Functional.h
 template<typename T, bool isGarbageCollected> struct PointerParamStorageTraits;