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

test/webkit/fast/js/kde/iteration.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 58 matching lines @@
 list = "";
 for ( var j in arr ) {
   list += "[" + j + "]=" + arr[j] + ";";
 }
 shouldBe("list","'[0]=100;[1]=101;'");
 
 list = "";
 for (var a = [1,2,3], length = a.length, i = 0; i < length; i++) {
   list += a[i];
 }
-shouldBe("list", "'123'");
+shouldBe("list", "'123'");