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

test/webkit/new-array-double-with-holes.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 13 matching lines @@
 description(
 "Tests that if array allocation profiling causes a new_array to allocate double arrays, then the holes end up being correctly initialized."
 );
 
 function foo(array, i) {
     return array[i];
 }
 
 for (var i = 0; i < 100; ++i)
     shouldBe("foo([, 1.5], 0)", "void 0");
-