Oilpan: fix build after r352251.

third_party/WebKit/Source/bindings/core/v8/RejectedPromises.h

 // Copyright 2015 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.
 
 #ifndef RejectedPromises_h
 #define RejectedPromises_h
 
 #include "platform/heap/Handle.h"
 
 namespace v8 {
@@ skipping 19 matching lines @@
     DECLARE_TRACE();
 
     void rejectedWithNoHandler(ScriptState*, v8::PromiseRejectMessage, const String& errorMessage, const String& resourceName, int scriptId, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>);
     void handlerAdded(v8::PromiseRejectMessage);
 
     void processQueue();
 
 private:
     class Message;
 
-    void processQueueNow(PassOwnPtrWillBeRawPtr<WillBeHeapDeque<OwnPtrWillBeMember<Message>>>);
+    using MessageQueue = WillBeHeapDeque<OwnPtrWillBeMember<Message>>;
+
+    PassOwnPtrWillBeRawPtr<MessageQueue> createMessageQueue();
+
+    void processQueueNow(PassOwnPtrWillBeRawPtr<MessageQueue>);
     void revokeNow(PassOwnPtrWillBeRawPtr<Message>);
 
-    WillBeHeapDeque<OwnPtrWillBeMember<Message>> m_queue;
+    MessageQueue m_queue;
     WillBeHeapVector<OwnPtrWillBeMember<Message>> m_reportedAsErrors;
 };
 
 } // namespace blink
 
 #endif // RejectedPromises_h