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

test/webkit/dfg-string-stricteq.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 31 matching lines @@
         return c - 1;
 }
 
 for (var i = 0; i < 1000; ++i) {
     var a = "blah" + i;
     var b = "blah" + (1000 - i);
     var areEqual = i == 500;
     shouldBe("foo({f:\"" + a + "\"}, {f:\"" + b + "\"})", "[" + (a.length + b.length) + ", " + areEqual + "]");
     shouldBe("bar({f:\"" + a + "\"}, {f:\"" + b + "\"})", "" + (areEqual ? a.length + b.length + 1 : a.length + b.length - 1));
 }
-