[telemetry] Change many relative paths to use util.Get*Dir().

tools/telemetry/telemetry/page/page_test_unittest.py

Index: tools/telemetry/telemetry/page/page_test_unittest.py
diff --git a/tools/telemetry/telemetry/page/page_test_unittest.py b/tools/telemetry/telemetry/page/page_test_unittest.py
index 6b68d9d2cd41009b6429515ff3e0eba46ce28cc3..3b2e626a2fcd17a617381a74ce5fb3f4231676a5 100644
--- a/tools/telemetry/telemetry/page/page_test_unittest.py
+++ b/tools/telemetry/telemetry/page/page_test_unittest.py
@@ -1,18 +1,18 @@
 # Copyright (c) 2013 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.
-import os
+
 import unittest
 
+from telemetry.core import util
 from telemetry.page import page as page_module
 from telemetry.page import page_test
 from telemetry.page.actions import all_page_actions
 from telemetry.page.actions import page_action
 
 def _CreatePage(test_filename):
-  url = 'file:///' + os.path.join('..', '..', 'unittest_data', test_filename)
-  base_dir = os.path.dirname(__file__)
-  page = page_module.Page(url, None, base_dir=base_dir)
+  url = 'file:///' + test_filename
+  page = page_module.Page(url, None, base_dir=util.GetUnittestDataDir())
   return page
 
 class DoNothingPageTest(page_test.PageTest):