Move [StrictTypeChecking] to interface (from members), where possible

Source/modules/webaudio/AudioBufferSourceNode.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.
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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 // A cached (non-streamed), memory-resident audio source
 [
-    Conditional=WEB_AUDIO
+    Conditional=WEB_AUDIO,
+    StrictTypeChecking,
 ] interface AudioBufferSourceNode : AudioSourceNode {
-    [StrictTypeChecking, RaisesException=Setter] attribute AudioBuffer buffer;
+    [RaisesException=Setter] attribute AudioBuffer buffer;
 
     const unsigned short UNSCHEDULED_STATE = 0;
     const unsigned short SCHEDULED_STATE = 1;
     const unsigned short PLAYING_STATE = 2;
     const unsigned short FINISHED_STATE = 3;
 
     readonly attribute unsigned short playbackState;
 
     readonly attribute AudioParam gain;
     readonly attribute AudioParam playbackRate;
 
     attribute boolean loop;
     attribute double loopStart;
     attribute double loopEnd;
 
     [RaisesException, MeasureAs=WebAudioStart] void start(optional double when, optional double grainOffset, optional double grainDuration);
     [RaisesException] void stop(optional double when);
 
     [RaisesException, ImplementedAs=start, MeasureAs=LegacyWebAudio] void noteOn(double when);
     [RaisesException, MeasureAs=LegacyWebAudio] void noteGrainOn(double when, double grainOffset, double grainDuration);
     [RaisesException, ImplementedAs=stop] void noteOff(double when);
 
     attribute EventHandler onended;
 };