Revert of Allow CrossThreadPersistent in collections

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

Index: third_party/WebKit/Source/platform/heap/PersistentNode.cpp
diff --git a/third_party/WebKit/Source/platform/heap/PersistentNode.cpp b/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
index 615b6cb76a356fdcadac8dc0dd2a834005e16ddc..2c512958fed0f56d3fa88e42fe2b6710c21e5b8d 100644
--- a/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
+++ b/third_party/WebKit/Source/platform/heap/PersistentNode.cpp
@@ -124,8 +124,7 @@
 bool CrossThreadPersistentRegion::shouldTracePersistentNode(Visitor* visitor, PersistentNode* node)
 {
     CrossThreadPersistent<DummyGCBase>* persistent = reinterpret_cast<CrossThreadPersistent<DummyGCBase>*>(node->self());
-    DCHECK(persistent);
-    DCHECK(!persistent->isHashTableDeletedValue());
+    ASSERT(persistent);
     Address rawObject = reinterpret_cast<Address>(persistent->get());
     if (!rawObject)
         return false;