Fix navigation to unittest files

tools/telemetry/telemetry/page/actions/navigate_unittest.py

 # Copyright 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.
 
-from telemetry.core import util
 from telemetry.page import page as page_module
 from telemetry.page.actions import navigate
 from telemetry.unittest import tab_test_case
-from telemetry.unittest import test
 
 
 class NavigateActionTest(tab_test_case.TabTestCase):
   def CreatePageFromUnittestDataDir(self, filename):
-    self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
+    self.Navigate(filename)
     return page_module.Page(
-        self._browser.http_server.UrlOf(filename),
+        self._browser.http_server.UrlOf(self.test_file_path),
         None  # In this test, we don't need a page set.
     )
 
-  @test.Disabled('chromeos')
   def testNavigateAction(self):
-    self._browser.SetHTTPServerDirectories(util.GetUnittestDataDir())
-
     page = self.CreatePageFromUnittestDataDir('blank.html')
     i = navigate.NavigateAction()
     i.RunAction(page, self._tab, None)
     self.assertEquals(
         self._tab.EvaluateJavaScript('document.location.pathname;'),
         '/blank.html')