[es6] Partially implement Reflect.setPrototypeOf.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 3667 matching lines @@
 
 
 Maybe<bool> v8::Object::SetPrototype(Local<Context> context,
                                      Local<Value> value) {
   PREPARE_FOR_EXECUTION_PRIMITIVE(context, "v8::Object::SetPrototype()", bool);
   auto self = Utils::OpenHandle(this);
   auto value_obj = Utils::OpenHandle(*value);
   // We do not allow exceptions thrown while setting the prototype
   // to propagate outside.
   TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
-  auto result = i::JSObject::SetPrototype(self, value_obj, false);
-  has_pending_exception = result.is_null();
+  auto result =
+      i::JSObject::SetPrototype(self, value_obj, false, i::THROW_ON_ERROR);
+  has_pending_exception = result.IsNothing();
   RETURN_ON_FAILED_EXECUTION_PRIMITIVE(bool);
   return Just(true);
 }
 
 
 bool v8::Object::SetPrototype(Local<Value> value) {
   auto context = ContextFromHeapObject(Utils::OpenHandle(this));
   return SetPrototype(context, value).FromMaybe(false);
 }
 
@@ skipping 4674 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8