Remove trailing commas from Blink IDLs

Source/core/fileapi/FileException.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:
  *
  *     * 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 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * 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.
  */
 
 [
     NoInterfaceObject,
-    DoNotCheckConstants,
+    DoNotCheckConstants
 ] exception FileException {
 
     readonly attribute unsigned short   code;
     readonly attribute DOMString        name;
     readonly attribute DOMString        message;
 
     // Override in a Mozilla compatible format
     [NotEnumerable] DOMString toString();
 
     // FileExceptionCode
     const unsigned short NOT_FOUND_ERR = 1;
     const unsigned short SECURITY_ERR = 2;
     const unsigned short ABORT_ERR = 3;
     const unsigned short NOT_READABLE_ERR = 4;
     const unsigned short ENCODING_ERR = 5;
     const unsigned short NO_MODIFICATION_ALLOWED_ERR = 6;
     const unsigned short INVALID_STATE_ERR = 7;
     const unsigned short SYNTAX_ERR = 8;
     const unsigned short INVALID_MODIFICATION_ERR = 9;
     const unsigned short QUOTA_EXCEEDED_ERR = 10;
     const unsigned short TYPE_MISMATCH_ERR = 11;
     const unsigned short PATH_EXISTS_ERR = 12;
 };