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

test/webkit/fast/js/kde/math.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 110 matching lines @@
 shouldBe("list","'a,b,'");
 
 // (check that Math's properties and functions are not enumerable)
 list=""
 for ( var i in Math ) { list += i + ','; }
 shouldBe("list","''");
 
 Math.myprop=true; // adding a custom property to the math object (why not?)
 list=""
 for ( var i in Math ) { list += i + ','; }
-shouldBe("list","'myprop,'");
+shouldBe("list","'myprop,'");