Fix path error in getting depot dir.

tools/auto_bisect/bisect_perf_regression_test.py

 # Copyright 2014 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 re
 import shutil
 import sys
 import unittest
 
@@ skipping 352 matching lines @@
     self.assertIsNone(results.error)
 
   @mock.patch('urllib2.urlopen')
   def testBisectResultsPosted(self, mock_urlopen):
     options_dict = dict(DEFAULT_OPTIONS)
     options_dict.update({
         'bisect_mode': bisect_utils.BISECT_MODE_MEAN,
         'try_job_id': 1234,
     })
     opts = bisect_perf_regression.BisectOptions.FromDict(options_dict)
+    bisect_instance = _GetBisectPerformanceMetricsInstance(options_dict)
     results = _SampleBisecResult(opts)
-    bisect_perf_regression._PostBisectResults(results, opts, os.getcwd())
+    bisect_instance.PostBisectResults(results)
 
     call_args = _GetMockCallArg(mock_urlopen, 0)
     self.assertIsNotNone(call_args)
     self.assertIn('"try_job_id": 1234', call_args[1])
 
   def _CheckAbortsEarly(self, results, **extra_opts):
     """Returns True if the bisect job would abort early."""
     global _MockResultsGenerator
     _MockResultsGenerator = (r for r in results)
     bisect_class = bisect_perf_regression.BisectPerformanceMetrics
@@ skipping 360 matching lines @@
          (None, 0)),
     ]
     self._SetupRunGitMock(try_cmd)
     bisect_perf_regression._StartBuilderTryJob(
         fetch_build.PERF_BUILDER, git_revision, bot_name, bisect_job_name,
         patch)
 
 
 if __name__ == '__main__':
   unittest.main()