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

tools/telemetry/telemetry/core/temporary_http_server_unittest.py

Index: tools/telemetry/telemetry/core/temporary_http_server_unittest.py
diff --git a/tools/telemetry/telemetry/core/temporary_http_server_unittest.py b/tools/telemetry/telemetry/core/temporary_http_server_unittest.py
index 984eb213329fa2fdced32bb1e73876a6fbed45ec..64ad67ec24edfcd7dcc5b83bf2b71f30b846040e 100644
--- a/tools/telemetry/telemetry/core/temporary_http_server_unittest.py
+++ b/tools/telemetry/telemetry/core/temporary_http_server_unittest.py
@@ -1,21 +1,20 @@
 # Copyright (c) 2012 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 browser_finder
+from telemetry.core import util
 from telemetry.unittest import options_for_unittests
 
 class TemporaryHTTPServerTest(unittest.TestCase):
   def testBasicHosting(self):
-    unittest_data_dir = os.path.join(os.path.dirname(__file__),
-                                     '..', '..', 'unittest_data')
     options = options_for_unittests.GetCopy()
     browser_to_create = browser_finder.FindBrowser(options)
     with browser_to_create.Create() as b:
       b.Start()
-      b.SetHTTPServerDirectories(unittest_data_dir)
+      b.SetHTTPServerDirectories(util.GetUnittestDataDir())
       t = b.tabs[0]
       t.Navigate(b.http_server.UrlOf('/blank.html'))
       t.WaitForDocumentReadyStateToBeComplete()