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

test/webkit/fast/js/kde/eval.js

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Copyright (C) 2005, 2006, 2007, 2008, 2009 Apple 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:
 // 1.  Redistributions of source code must retain the above copyright
 //     notice, this list of conditions and the following disclaimer.
 // 2.  Redistributions in binary form must reproduce the above copyright
 //     notice, this list of conditions and the following disclaimer in the
@@ skipping 35 matching lines @@
 } else {
   testPassed("Skipping test for deprecated Object.prototype.eval()");
 }
 
 // problem from within khtml
 function lotto() {
   // j must be accessible to eval()
   for (var j = 0; j < 1; j++)
     return eval('j');
 }
-shouldBe("lotto()", "0");
+shouldBe("lotto()", "0");