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

test/webkit/throw-from-finally.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 60 matching lines @@
         } finally {
             events.push("5:hi");
             throw "5:wat";
         }
     }
 } catch (e) {
     events.push(e);
 }
 
 shouldBe("\"\" + events", "\"1:try,1:finally,2:finally,2:thingy,3:thingy,3:finally,4:thingy,4:finally,4:another thingy,5:hi,5:wat\"");
-