Use "int" instead of "long" for bindings where the WebIDL uses "long".

Source/modules/mediastream/RTCDTMFSender.h

Index: Source/modules/mediastream/RTCDTMFSender.h
diff --git a/Source/modules/mediastream/RTCDTMFSender.h b/Source/modules/mediastream/RTCDTMFSender.h
index cb8cc329ac73042fd64ab50f48db13a2ced0a887..64dac55f3e4939e034e8632a2c4d8c9081e673dc 100644
--- a/Source/modules/mediastream/RTCDTMFSender.h
+++ b/Source/modules/mediastream/RTCDTMFSender.h
@@ -48,12 +48,12 @@ public:
     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);
 
@@ -84,8 +84,8 @@ private:
     virtual void didPlayTone(const String&) OVERRIDE;
 
     RefPtr<MediaStreamTrack> m_track;
-    long m_duration;
-    long m_interToneGap;
+    int m_duration;
+    int m_interToneGap;
 
     OwnPtr<RTCDTMFSenderHandler> m_handler;