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

test/mjsunit/compiler/inline-throw.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 48 matching lines @@
 
 for (var i = 0; i < 5; i++) h(0);
 %OptimizeFunctionOnNextCall(h);
 assertEquals("yes", h(0));
 
 try {
   h(43);
 } catch(e) {
   assertEquals("wow", e);
 }
-