WebAudio: Remove legacy support for numerical values for Oscillator types.

Source/modules/webaudio/OscillatorNode.idl

Index: Source/modules/webaudio/OscillatorNode.idl
diff --git a/Source/modules/webaudio/OscillatorNode.idl b/Source/modules/webaudio/OscillatorNode.idl
index 7cbe29dbd3070fc80d1ff7c3eb03cfbaf1a5569f..5507a8fa8dd1f6e0be9b7049a90ae17f9c8e03cb 100644
--- a/Source/modules/webaudio/OscillatorNode.idl
+++ b/Source/modules/webaudio/OscillatorNode.idl
@@ -27,14 +27,7 @@
     Conditional=WEB_AUDIO
 ] interface OscillatorNode : AudioSourceNode {
 
-    // Type constants.
-    const unsigned short SINE = 0;
-    const unsigned short SQUARE = 1;
-    const unsigned short SAWTOOTH = 2;
-    const unsigned short TRIANGLE = 3;
-    const unsigned short CUSTOM = 4;
-
-    [Custom=Setter] attribute DOMString type;
+    attribute DOMString type;
 
     // Playback state constants.
     const unsigned short UNSCHEDULED_STATE = 0;