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

tools/telemetry/telemetry/core/tab_unittest.py

Index: tools/telemetry/telemetry/core/tab_unittest.py
diff --git a/tools/telemetry/telemetry/core/tab_unittest.py b/tools/telemetry/telemetry/core/tab_unittest.py
index 156c935a7879887b6711b1dfc1aff710d94cb234..7c356bfd5704d1494b93750d4efa28e528fe7e49 100644
--- a/tools/telemetry/telemetry/core/tab_unittest.py
+++ b/tools/telemetry/telemetry/core/tab_unittest.py
@@ -1,8 +1,8 @@
 # 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 logging
-import os
 import time
 
 from telemetry.core import util
@@ -19,16 +19,12 @@ def _IsDocumentVisible(tab):
 
 class TabTest(tab_test_case.TabTestCase):
   def testNavigateAndWaitToForCompleteState(self):
-    unittest_data_dir = os.path.join(os.path.dirname(__file__),
-                                     '..', '..', 'unittest_data')
-    self._browser.SetHTTPServerDirectories(unittest_data_dir)
+    self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
     self._tab.Navigate(self._browser.http_server.UrlOf('blank.html'))
     self._tab.WaitForDocumentReadyStateToBeComplete()
 
   def testNavigateAndWaitToForInteractiveState(self):
-    unittest_data_dir = os.path.join(os.path.dirname(__file__),
-                                     '..', '..', 'unittest_data')
-    self._browser.SetHTTPServerDirectories(unittest_data_dir)
+    self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
     self._tab.Navigate(self._browser.http_server.UrlOf('blank.html'))
     self._tab.WaitForDocumentReadyStateToBeInteractiveOrBetter()
 
@@ -64,9 +60,7 @@ class GpuTabTest(tab_test_case.TabTestCase):
       logging.warning('Browser does not support screenshots, skipping test.')
       return
 
-    unittest_data_dir = os.path.join(os.path.dirname(__file__),
-                                     '..', '..', 'unittest_data')
-    self._browser.SetHTTPServerDirectories(unittest_data_dir)
+    self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
     self._tab.Navigate(
       self._browser.http_server.UrlOf('green_rect.html'))
     self._tab.WaitForDocumentReadyStateToBeComplete()