Added check for trailing whitespaces and corrected existing violations.

test/mjsunit/regress/regress-937896.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 23 matching lines @@
     for (var i = 0; i < 2; i++) {
       continue;
       try {
         continue;
         continue;
       } catch (ex) {
         // Empty.
       }
     }
   } catch (e) {
-    // Empty. 
+    // Empty.
   }
   return 42;
 }
 
 
 assertEquals(42, f());