Fix git log command to while processing Commit position in SVNFindRev method

tools/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 unittest
 
 from auto_bisect import source_control as source_control_module
 
 # Special import necessary because filename contains dash characters.
@@ skipping 247 matching lines @@
       'command': 'fake_command',
       'metric': 'fake/metric',
       'good_revision': 280000,
       'bad_revision': 280005,
     }
     bisect_options = bisect_perf_module.BisectOptions.FromDict(options_dict)
     source_control = source_control_module.DetermineAndCreateSourceControl(
         bisect_options)
 
     cp_git_rev = '7017a81991de983e12ab50dfc071c70e06979531'
-    self.assertEqual(291915, source_control.SVNFindRev(cp_git_rev))
+    self.assertEqual(291765, source_control.SVNFindRev(cp_git_rev))
 
     svn_git_rev = 'e6db23a037cad47299a94b155b95eebd1ee61a58'
     self.assertEqual(291467, source_control.SVNFindRev(svn_git_rev))
 
 if __name__ == '__main__':
   unittest.main()