Drop [LegacyInterfaceTypeChecking] for the Web Audio API

third_party/WebKit/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 25 matching lines @@
 ] interface OscillatorNode : AudioSourceNode {
 
     [RaisesException=Setter] 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);
 
-    [LegacyInterfaceTypeChecking] void setPeriodicWave(PeriodicWave periodicWave);
+    void setPeriodicWave(PeriodicWave periodicWave);
 
     attribute EventHandler onended;
 };