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

test/webkit/fast/js/function-decompilation-operators.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 62 matching lines @@
         "1",
         "-1",
         "- -1",
         "- - 0",
         "- - NaN"
     ];
 
     for (test in tests) {
         var decompiledFunction = eval("(function () {  " + tests[test] + ";})").toString().replace(/\n/g, "");
         shouldBe("decompiledFunction", "'function () {  " + tests[test] + ";}'");
-    }
+    }