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

test/webkit/fast/js/deep-recursion-test.js

Index: test/webkit/fast/js/deep-recursion-test.js
diff --git a/test/webkit/fast/js/deep-recursion-test.js b/test/webkit/fast/js/deep-recursion-test.js
index 59df2f1c9ad72b4fc13dd6822299e1f4558b32d1..c2a695da4680e511224a4571b98bd2227ce213a8 100644
--- a/test/webkit/fast/js/deep-recursion-test.js
+++ b/test/webkit/fast/js/deep-recursion-test.js
@@ -75,4 +75,4 @@ description("This test how deep we can recurse, and that we get an exception whe
     } catch (ex) {
         var msg = String(eval(ex));
         shouldBe("msg", "'RangeError: Maximum call stack size exceeded.'");
-    }
+    }