Version 2.5.2

src/property.h

Index: src/property.h
diff --git a/src/property.h b/src/property.h
index 01c58def3ee68152199091bc2e831aef2d7e51f5..4715a725f1a4a0e36ce02109ba02a3807e97987a 100644
--- a/src/property.h
+++ b/src/property.h
@@ -45,10 +45,12 @@ class Descriptor BASE_EMBEDDED {
     return Smi::cast(value)->value();
   }
 
-  Object* KeyToSymbol() {
+  MUST_USE_RESULT MaybeObject* KeyToSymbol() {
     if (!StringShape(key_).IsSymbol()) {
-      Object* result = Heap::LookupSymbol(key_);
-      if (result->IsFailure()) return result;
+      Object* result;
+      { MaybeObject* maybe_result = Heap::LookupSymbol(key_);
+        if (!maybe_result->ToObject(&result)) return maybe_result;
+      }
       key_ = String::cast(result);
     }
     return key_;