Use "int" rather than "long" for C++ code interacting with WebIDL's "long".

Source/modules/mediastream/RTCDTMFSender.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<RTCDTMFSender>);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(RTCDTMFSender);
 public:
     static RTCDTMFSender* create(ExecutionContext*, WebRTCPeerConnectionHandler*, MediaStreamTrack*, ExceptionState&);
     virtual ~RTCDTMFSender();
 
     bool canInsertDTMF() const;
     MediaStreamTrack* track() const;
     String toneBuffer() const;
-    long duration() const { return m_duration; }
-    long interToneGap() const { return m_interToneGap; }
+    int duration() const { return m_duration; }
+    int interToneGap() const { return m_interToneGap; }
 
     void insertDTMF(const String& tones, ExceptionState&);
-    void insertDTMF(const String& tones, long duration, ExceptionState&);
-    void insertDTMF(const String& tones, long duration, long interToneGap, ExceptionState&);
+    void insertDTMF(const String& tones, int duration, ExceptionState&);
+    void insertDTMF(const String& tones, int duration, int interToneGap, ExceptionState&);
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(tonechange);
 
     // EventTarget
     virtual const AtomicString& interfaceName() const override;
     virtual ExecutionContext* executionContext() const override;
 
     // ActiveDOMObject
     virtual void stop() override;
 
     virtual void trace(Visitor*) override;
 
 private:
     RTCDTMFSender(ExecutionContext*, MediaStreamTrack*, PassOwnPtr<WebRTCDTMFSenderHandler>);
 
     void scheduleDispatchEvent(PassRefPtrWillBeRawPtr<Event>);
     void scheduledEventTimerFired(Timer<RTCDTMFSender>*);
 
     // WebRTCDTMFSenderHandlerClient
     virtual void didPlayTone(const WebString&) override;
 
     Member<MediaStreamTrack> m_track;
-    long m_duration;
-    long m_interToneGap;
+    int m_duration;
+    int m_interToneGap;
 
     OwnPtr<WebRTCDTMFSenderHandler> m_handler;
 
     bool m_stopped;
 
     Timer<RTCDTMFSender> m_scheduledEventTimer;
     WillBeHeapVector<RefPtrWillBeMember<Event> > m_scheduledEvents;
 };
 
 } // namespace blink
 
 #endif // RTCDTMFSender_h