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

test/mjsunit/compare-character.js

 // Copyright 2008 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 29 matching lines @@
   assertEquals(x <= f, x <= 'f', "<=" + x);
   assertEquals(x > f, x > 'f', ">" + x);
   assertEquals(x >= f, x >= 'f', ">=" + x);
   assertEquals(f == x, 'f' == x, "==r" + x);
   assertEquals(f === x, 'f' === x, "===r" + x);
   assertEquals(f > x, 'f' > x, "<r" + x);
   assertEquals(f >= x, 'f' >= x, "<=r" + x);
   assertEquals(f < x, 'f' < x, ">r" + x);
   assertEquals(f <= x, 'f' <= x, ">=r" + x);
 }
-