[Oilpan] Add use-after-free detector in Member<>

third_party/WebKit/Source/platform/heap/Heap.h

Index: third_party/WebKit/Source/platform/heap/Heap.h
diff --git a/third_party/WebKit/Source/platform/heap/Heap.h b/third_party/WebKit/Source/platform/heap/Heap.h
index 67a8bc873ef643166d19459cecc0c07fab89dab3..263b1c3350eaceeb89e964fc5390bf511d518908 100644
--- a/third_party/WebKit/Source/platform/heap/Heap.h
+++ b/third_party/WebKit/Source/platform/heap/Heap.h
@@ -96,17 +96,17 @@ public:
     template<typename T>
     static inline bool isHeapObjectAlive(const Member<T>& member)
     {
-        return isHeapObjectAlive(member.get());
+        return isHeapObjectAlive(member.unsafeGet());
     }
     template<typename T>
     static inline bool isHeapObjectAlive(const WeakMember<T>& member)
     {
-        return isHeapObjectAlive(member.get());
+        return isHeapObjectAlive(member.unsafeGet());
     }
     template<typename T>
     static inline bool isHeapObjectAlive(const UntracedMember<T>& member)
     {
-        return isHeapObjectAlive(member.get());
+        return isHeapObjectAlive(member.unsafeGet());
     }
     template<typename T>
     static inline bool isHeapObjectAlive(const RawPtr<T>& ptr)