Remove the WEB_AUDIO compile time flag

third_party/WebKit/Source/modules/webaudio/ChannelMergerNode.idl

 /*
  * Copyright (C) 2010 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:
  *
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  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
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  *     documentation and/or other materials provided with the distribution.
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  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
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  */
 
-[
-    Conditional=WEB_AUDIO
-] interface ChannelMergerNode : AudioNode {
+interface ChannelMergerNode : AudioNode {
 };