Change dos line endings to unix line endings in a number of mjsunit test file...

test/mjsunit/debug-stepin-builtin.js

 // Copyright 2009 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 58 matching lines @@
   var s = Array.prototype.slice.call(a, 2,3);
 }  // expected line
 
 state = 1;
 testStepInArraySlice();
 assertNull(exception);
 assertEquals(3, state);
 
 // Get rid of the debug event listener.
 Debug.setListener(null);