Add [TypeChecking=Unrestricted] to Web Audio interfaces

Source/modules/webaudio/OscillatorNode.idl

 /*
  * Copyright (C) 2012, 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 11 matching lines @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 enum OscillatorType {
     "sine",
     "square",
     "sawtooth",
     "triangle",
     "custom"
 };
-    
+
 // OscillatorNode is an audio generator of periodic waveforms.
 [
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    TypeChecking=Unrestricted,
 ] interface OscillatorNode : AudioSourceNode {
 
     attribute OscillatorType type;
 
     readonly attribute AudioParam frequency; // in Hertz
     readonly attribute AudioParam detune; // in Cents
 
     [RaisesException] void start(optional double when);
     [RaisesException] void stop(optional double when);
 
     void setPeriodicWave(PeriodicWave periodicWave);
 
     attribute EventHandler onended;
 };