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

test/mjsunit/compiler/regress-closures-with-eval.js

Index: test/mjsunit/compiler/regress-closures-with-eval.js
diff --git a/test/mjsunit/compiler/regress-closures-with-eval.js b/test/mjsunit/compiler/regress-closures-with-eval.js
index 57afb1643efcdcf9ea3aef981769259a49e7d5fb..d95d128a9d717126eef57a38f6f960a44510f034 100644
--- a/test/mjsunit/compiler/regress-closures-with-eval.js
+++ b/test/mjsunit/compiler/regress-closures-with-eval.js
@@ -53,4 +53,4 @@ for (var n = 0; n < 5; n++) {
   withEval(expr, function(a) { return a; });
 }
 %OptimizeFunctionOnNextCall(withEval);
-withEval(expr, function(a) { return a; });
+withEval(expr, function(a) { return a; });