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

test/webkit/fast/js/kde/parse.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 45 matching lines @@
 shouldBe("var f\\u0030 = 103; f0", "103");
 
 // non-ASCII identifier letters as escape sequences
 shouldBe("var \\u00E9\\u0100\\u02AF\\u0388\\u18A8 = 104; \\u00E9\\u0100\\u02AF\\u0388\\u18A8;", "104");
 
 // invalid identifier characters as escape sequences
 shouldThrow("var f\\u00F7;");
 shouldThrow("var \\u0030;");
 shouldThrow("var test = { }; test.i= 0; test.i\\u002b= 1; test.i;");
 
-shouldBe("var test = { }; test.i= 0; test.i\u002b= 1; test.i;", "1");
+shouldBe("var test = { }; test.i= 0; test.i\u002b= 1; test.i;", "1");