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

Source/modules/mediastream/RTCDTMFSender.cpp

Index: Source/modules/mediastream/RTCDTMFSender.cpp
diff --git a/Source/modules/mediastream/RTCDTMFSender.cpp b/Source/modules/mediastream/RTCDTMFSender.cpp
index 110e240f70d0e0894cec4ab5ae339daee6ef4b15..d3cfad18808160d992c9ae7706e990effc0c4e70 100644
--- a/Source/modules/mediastream/RTCDTMFSender.cpp
+++ b/Source/modules/mediastream/RTCDTMFSender.cpp
@@ -38,11 +38,11 @@
 
 namespace blink {
 
-static const long minToneDurationMs = 70;
-static const long defaultToneDurationMs = 100;
-static const long maxToneDurationMs = 6000;
-static const long minInterToneGapMs = 50;
-static const long defaultInterToneGapMs = 50;
+static const int minToneDurationMs = 70;
+static const int defaultToneDurationMs = 100;
+static const int maxToneDurationMs = 6000;
+static const int minInterToneGapMs = 50;
+static const int defaultInterToneGapMs = 50;
 
 RTCDTMFSender* RTCDTMFSender::create(ExecutionContext* context, WebRTCPeerConnectionHandler* peerConnectionHandler, MediaStreamTrack* track, ExceptionState& exceptionState)
 {
@@ -93,12 +93,12 @@ void RTCDTMFSender::insertDTMF(const String& tones, ExceptionState& exceptionSta
     insertDTMF(tones, defaultToneDurationMs, defaultInterToneGapMs, exceptionState);
 }
 
-void RTCDTMFSender::insertDTMF(const String& tones, long duration, ExceptionState& exceptionState)
+void RTCDTMFSender::insertDTMF(const String& tones, int duration, ExceptionState& exceptionState)
 {
     insertDTMF(tones, duration, defaultInterToneGapMs, exceptionState);
 }
 
-void RTCDTMFSender::insertDTMF(const String& tones, long duration, long interToneGap, ExceptionState& exceptionState)
+void RTCDTMFSender::insertDTMF(const String& tones, int duration, int interToneGap, ExceptionState& exceptionState)
 {
     if (!canInsertDTMF()) {
         exceptionState.throwDOMException(NotSupportedError, "The 'canInsertDTMF' attribute is false: this sender cannot send DTMF.");