Disable collection backing reallocation during pre finalizer

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

Index: third_party/WebKit/Source/platform/heap/Heap.cpp
diff --git a/third_party/WebKit/Source/platform/heap/Heap.cpp b/third_party/WebKit/Source/platform/heap/Heap.cpp
index b743592002f0feb05132e6c6f26a0518c8a39aad..c36c0eb625f385a8632543321e722007ce67967f 100644
--- a/third_party/WebKit/Source/platform/heap/Heap.cpp
+++ b/third_party/WebKit/Source/platform/heap/Heap.cpp
@@ -359,6 +359,11 @@ void ThreadHeap::WeakProcessing(Visitor* visitor) {
   TRACE_EVENT0("blink_gc", "ThreadHeap::weakProcessing");
   double start_time = WTF::CurrentTimeMS();
 
+  // Weak processing may access unmarked objects but are forbidden from
+  // ressurecting them.
+  ThreadState::ObjectResurrectionForbiddenScope object_resurrection_forbidden(
+      ThreadState::Current());
+
   // Call weak callbacks on objects that may now be pointing to dead objects.
   while (PopAndInvokeWeakCallback(visitor)) {
   }