combine base_unittest.py modules from gm and tools

gm/rebaseline_server/download_actuals_test.py

 #!/usr/bin/python
 
 """
 Copyright 2014 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Test download.py
 
 TODO(epoger): Create a command to update the expected results (in
 self._output_dir_expected) when appropriate.  For now, you should:
-1. examine the results in self._output_dir_actual and make sure they are ok
+1. examine the results in self.output_dir_actual and make sure they are ok
 2. rm -rf self._output_dir_expected
-3. mv self._output_dir_actual self._output_dir_expected
+3. mv self.output_dir_actual self._output_dir_expected
 Although, if you're using an SVN checkout, this will blow away .svn directories
 within self._output_dir_expected, which wouldn't be good...
 
 """
 
 # System-level imports
 import os
 
 # Must fix up PYTHONPATH before importing from within Skia
 import fix_pythonpath  # pylint: disable=W0611
 
 # Imports from within Skia
 from py.utils import url_utils
 import base_unittest
 import download_actuals
 
 
 class DownloadTest(base_unittest.TestCase):
 
   def test_fetch(self):
     """Tests fetch() of GM results from actual-results.json ."""
     downloader = download_actuals.Download(
         actuals_base_url=url_utils.create_filepath_url(
-            os.path.join(self._input_dir, 'gm-actuals')),
+            os.path.join(self.input_dir, 'gm-actuals')),
         gm_actuals_root_url=url_utils.create_filepath_url(
-            os.path.join(self._input_dir, 'fake-gm-imagefiles')))
+            os.path.join(self.input_dir, 'fake-gm-imagefiles')))
     downloader.fetch(
         builder_name='Test-Android-GalaxyNexus-SGX540-Arm7-Release',
-        dest_dir=self._output_dir_actual)
+        dest_dir=self.output_dir_actual)
 
 
 def main():
   base_unittest.main(DownloadTest)
 
 
 if __name__ == '__main__':
   main()