Make ScriptPromiseResolver RefCountedWillBeRefCountedGarbageCollected.

Source/modules/serviceworkers/Body.cpp

 // Copyright 2014 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 "config.h"
 #include "modules/serviceworkers/Body.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
@@ skipping 213 matching lines @@
 {
     if (m_resolver)
         return true;
     if (m_streamAccessed && (m_stream->state() == ReadableStream::Readable || m_stream->state() == ReadableStream::Waiting))
         return true;
     return false;
 }
 
 void Body::trace(Visitor* visitor)
 {
+    visitor->trace(m_resolver);
     visitor->trace(m_stream);
     visitor->trace(m_streamSource);
 }
 
 Body::Body(ExecutionContext* context)
     : ActiveDOMObject(context)
     , m_bodyUsed(false)
     , m_streamAccessed(false)
     , m_responseType(ResponseType::ResponseUnknown)
     , m_streamSource(new ReadableStreamSource(this))
@@ skipping 124 matching lines @@
 
     if (m_resolver) {
         // FIXME: We should reject the promise.
         m_resolver->resolve("");
         m_resolver.clear();
     }
     m_stream->error(DOMException::create(NetworkError, "network error"));
 }
 
 } // namespace blink