Rename ExceptionCode constants to use the names in the spec (2/3)

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 93f64b83a49c503f9331f544b9bbb195fb9072c8..e8f38f0cc02c96541382a86afcd82135dc0283d4 100644
--- a/Source/modules/mediastream/RTCDTMFSender.cpp
+++ b/Source/modules/mediastream/RTCDTMFSender.cpp
@@ -106,12 +106,12 @@ void RTCDTMFSender::insertDTMF(const String& tones, long duration, long interTon
     }
 
     if (duration > maxToneDurationMs || duration < minToneDurationMs) {
-        ec = SYNTAX_ERR;
+        ec = SyntaxError;
         return;
     }
 
     if (interToneGap < minInterToneGapMs) {
-        ec = SYNTAX_ERR;
+        ec = SyntaxError;
         return;
     }
 
@@ -119,7 +119,7 @@ void RTCDTMFSender::insertDTMF(const String& tones, long duration, long interTon
     m_interToneGap = interToneGap;
 
     if (!m_handler->insertDTMF(tones, m_duration, m_interToneGap))
-        ec = SYNTAX_ERR;
+        ec = SyntaxError;
 }
 
 void RTCDTMFSender::didPlayTone(const String& tone)