Make sure files end with exactly one new line and police this in presubmit.

test/mjsunit/with-value.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 17 matching lines @@
 // Values used in 'with' statements should be wrapped in an object
 // before establishing the context.
 (function() {
   // 7 should be converted to an number object
   with (7) { assertTrue(typeof valueOf == 'function'); }
 })();
 
 /* This should be fairly easy again. May need some work in the
 compiler's VisitWith() function, or perhaps the runtime routine's
 PushContextForWith().
-*/
+*/