Update idl files in third_party/WebCore

Modules/webaudio/AudioContext.idl

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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
@@ skipping 10 matching lines @@
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 [
     Conditional=WEB_AUDIO,
     ActiveDOMObject,
     CustomConstructor,
     ConstructorParameters=0,
-    JSCustomMarkFunction,
     EventTarget
 ] interface AudioContext {
     // All rendered audio ultimately connects to destination, which represents the audio hardware.
     readonly attribute AudioDestinationNode destination;
 
     // All scheduled times are relative to this time in seconds.
     readonly attribute float currentTime;
 
     // All AudioNodes in the context run at this sample-rate (in sample-frames per second).
     readonly attribute float sampleRate;
@@ skipping 56 matching lines @@
 #if defined(ENABLE_LEGACY_WEB_AUDIO) && ENABLE_LEGACY_WEB_AUDIO
     [V8MeasureAs=LegacyWebAudio, ImplementedAs=createGain] GainNode createGainNode();
     [V8MeasureAs=LegacyWebAudio, ImplementedAs=createDelay] DelayNode createDelayNode(in [Optional] double maxDelayTime) 
         raises(DOMException);
 
     [V8MeasureAs=LegacyWebAudio, ImplementedAs=createScriptProcessor] ScriptProcessorNode createJavaScriptNode(in unsigned long bufferSize, in [Optional] unsigned long numberOfInputChannels, in [Optional] unsigned long numberOfOutputChannels)
         raises(DOMException);
 #endif
 
 };