Remove trailing commas from Blink IDLs

Source/modules/speech/SpeechRecognition.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:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 10 matching lines @@
  * 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.
  */
 
 [
     NoInterfaceObject,
     ActiveDOMObject,
     Constructor,
     CallWith=ScriptExecutionContext,
-    EventTarget,
+    EventTarget
 ] interface SpeechRecognition {
     attribute SpeechGrammarList grammars;
     attribute DOMString lang;
     attribute boolean continuous;
     attribute boolean interimResults;
     attribute unsigned long maxAlternatives;
 
     [RaisesException] void start();
     [ImplementedAs=stopFunction] void stop();
     void abort();
@@ skipping 12 matching lines @@
 
     // EventTarget interface
     void addEventListener(DOMString type,
                           EventListener listener,
                           optional boolean useCapture);
     void removeEventListener(DOMString type,
                              EventListener listener,
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event evt);
 };