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

test/webkit/dfg-intrinsic-unused-this.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 32 matching lines @@
 
     // Create some bizzare object to prevent method_check optimizations, since those will result in
     // a failure while the function is still live.
     var object = {};
     object["a" + i] = i;
     object.stuff = functionToCall;
     object.f = 42;
 
     shouldBe("baz(object, " + i + ", " + (i * 2) + ")", "" + (offset + Math.max(i, i * 2)));
 }
-