Revert of Canonicalize handles for optimized compilation.

src/json-stringifier.h

Index: src/json-stringifier.h
diff --git a/src/json-stringifier.h b/src/json-stringifier.h
index fb990d460738b29182f6da80de3dc6fd3b4841dc..c06256d4d737faf9bc0958ed38ff71dd67e03a06 100644
--- a/src/json-stringifier.h
+++ b/src/json-stringifier.h
@@ -222,7 +222,6 @@
     SerializeStringUnchecked_(object->GetFlatContent().ToOneByteVector(),
                               &no_extend);
     no_extend.Append('\"');
-    return no_extend.Finalize();
   } else {
     result = isolate->factory()
                  ->NewRawTwoByteString(worst_case_length)
@@ -233,8 +232,8 @@
     SerializeStringUnchecked_(object->GetFlatContent().ToUC16Vector(),
                               &no_extend);
     no_extend.Append('\"');
-    return no_extend.Finalize();
-  }
+  }
+  return result;
 }