Fix private style in ct-commit-data.html.

Tools/GardeningServer/ui/ct-commit-data-tests.html

+<!--
+Copyright 2014 The Chromium Authors. All rights reserved.
+Use of this source code is governed by a BSD-style license that can be
+found in the LICENSE file.
+-->
+
+<link rel="import" href="ct-commit-data.html">
+
+<script>
+(function () {
+
+module("ct-commit-data");
+
+asyncTest("basic", 2, function() {
+  // FIXME: ct-commit-data should be self-contained instead of depending on this static function.
+  var oldCommitDataListForRevisionRange = model.commitDataListForRevisionRange;
+  var reset = function() {
+    model.commitDataListForRevisionRange = oldCommitDataListForRevisionRange;
+  }
+
+  try {
+    model.commitDataListForRevisionRange = function(first, last) { return [first + ':' + last]; };
+
+    var commitData = document.createElement('ct-commit-data');
+
+    commitData.first = 1;
+    commitData.last = 2;
+
+    commitData.async(function() {
+      reset();
+      equal(commitData.data.length, 1);
+      equal(commitData.data[0], '1:2');
+      start();
+    });
+  } catch(e) {
+    reset();
+  }
+
+});
+
+})()
+</script>