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

test/webkit/dfg-integer-optimization.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 25 matching lines @@
 for (var i = 0; i < 1000; ++i) {
     // Create numbers big enough that we'll start seeing doubles only after about 200 invocations.
     var a = i * 1000 * 1000 * 10;
     var b = i * 1000 * 1000 * 10 + 1;
     var result = doAdd(a, b);
 
     // Use eval() for computing the correct result, to force execution to happen outside the DFG.
     shouldBe("result.a", "" + eval("((" + a + " + " + b + ") | 0)"))
     shouldBe("result.b", "" + eval(a + " + " + b))
 }
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