Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/regress/regress-1213575.js

 // Copyright 2008 the V8 project authors. 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 documentation and/or other materials provided
@@ skipping 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Make sure that a const definition always
 // conflicts with a defined setter. This avoid
 // trying to pass 'the hole' to the setter.
 
 this.__defineSetter__('x', function(value) { assertTrue(false); });
 
 var caught = false;
 try {
-  eval('const x'); 
+  eval('const x');
 } catch(e) {
   assertTrue(e instanceof TypeError);
   caught = true;
 }
 assertTrue(caught);