Remove trailing commas from Blink IDLs

Source/bindings/tests/idls/TestTypedefs.idl

 /*
  * Copyright (C) 2013 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
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 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.
  */
 
 // This IDL file is for testing the bindings code generator and for tracking
 // changes in its ouput.
 
 [
-    Constructor(STRING hello, TEST_CALLBACK testCallback),
+    Constructor(STRING hello, TEST_CALLBACK testCallback)
 ] interface TestTypedefs {
     attribute ULONGLONG unsignedLongLongAttr;
 
     [Immutable] attribute SCRIPT_VALUE immutableSerializedScriptValue;
     
     static readonly attribute T TestSubObj;
 
     [StrictTypeChecking] void func(optional ARRAY_OF_LONGS x);
 
     void setShadow(DOUBLE width, DOUBLE height, float blur, [StrictTypeChecking] optional STRING color, optional DOUBLE alpha);
@@ skipping 22 matching lines @@
 typedef [Clamp] unsigned long long ULONGLONG_CLAMP;
 typedef SerializedScriptValue      SCRIPT_VALUE;
 typedef long[]                     ARRAY_OF_LONGS;
 typedef SVGPoint                   SVGPOINT;
 typedef DOMString                  STRING;
 typedef DOMString[]                ARRAY_OF_STRINGS;
 typedef TestCallback               TEST_CALLBACK;
 typedef TestSubObjConstructor      T;
 typedef Array                      ARRAY;
 typedef DOMException               E;