Revert of Rehash and clear deleted entries in weak collections during GC

src/heap/mark-compact.cc

Index: src/heap/mark-compact.cc
diff --git a/src/heap/mark-compact.cc b/src/heap/mark-compact.cc
index 43720a4449c73df495ddcc6d8f1b1bbd15a27e3b..ac595e6f5fb8d7b800dc22248d61549718e890d1 100644
--- a/src/heap/mark-compact.cc
+++ b/src/heap/mark-compact.cc
@@ -2549,13 +2549,6 @@
         if (!MarkCompactCollector::IsMarked(key)) {
           table->RemoveEntry(i);
         }
-      }
-      // Rehash if more than 25% of the entries are deleted entries.
-      // TODO(jochen): Consider to shrink the fixed array in place.
-      if ((table->NumberOfDeletedElements() << kJSWeakCollectionLoadFactorExp) >
-          table->NumberOfElements()) {
-        HandleScope scope(heap()->isolate());
-        table->Rehash(heap()->isolate()->factory()->undefined_value());
       }
     }
     weak_collection_obj = weak_collection->next();