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

test/webkit/dfg-constant-fold-logical-not-branch.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 33 matching lines @@
 
 Stuff.prototype = {
     thingy: function(x) { return x + 1; },
     otherThingy: function(x) { return x - 1; }
 };
 
 for (var i = 0; i < 1000; ++i) {
     shouldBe("foo1(new Stuff())", "43");
     shouldBe("foo2(new Stuff())", "58");
 }
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-