Fix comment about when we rehash ObjectHashTables before growing them

R=ulan@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/1918403003
Cr-Commit-Position: refs/heads/master@{#35853}

src/objects.cc

@@ -17929,7 +17929,7 @@ Handle<ObjectHashTable> ObjectHashTable::Put(Handle<ObjectHashTable> table,
     return table;
   }
 
-  // Rehash if more than 25% of the entries are deleted entries.
+  // Rehash if more than 33% of the entries are deleted entries.
   // TODO(jochen): Consider to shrink the fixed array in place.
   if ((table->NumberOfDeletedElements() << 1) > table->NumberOfElements()) {
     table->Rehash(isolate->factory()->undefined_value());