[ES6 modules] Make Modulator regular GCollected / not mixin

third_party/WebKit/Source/core/testing/DummyModulator.cpp

 // Copyright 2017 The Chromium 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 "core/testing/DummyModulator.h"
 
 namespace blink {
 
 DummyModulator::DummyModulator() {}
 
 DummyModulator::~DummyModulator() {}
 
-DEFINE_TRACE(DummyModulator) {}
+DEFINE_TRACE(DummyModulator) {
+  Modulator::trace(visitor);
+}
 
 ReferrerPolicy DummyModulator::referrerPolicy() {
   NOTREACHED();
   return ReferrerPolicyDefault;
 }
 
 SecurityOrigin* DummyModulator::securityOrigin() {
   NOTREACHED();
   return nullptr;
 }
@@ skipping 14 matching lines @@
   NOTREACHED();
 }
 
 ScriptModule DummyModulator::compileModule(const String& script,
                                            const String& urlStr) {
   NOTREACHED();
   return ScriptModule();
 }
 
 }  // namespace blink