Unset some environment vars so they can be set up via the bisect script.

build/android/buildbot/bb_host_steps.py

 #!/usr/bin/env python
 # 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.
 
 import os
 import sys
 
 import bb_utils
 import bb_annotations
@@ skipping 82 matching lines @@
   RunCmd([SrcPath(
       'tools', 'android', 'findbugs_plugin', 'test',
       'run_findbugs_plugin_tests.py')] + build_type)
 
 
 def BisectPerfRegression(_):
   bb_annotations.PrintNamedStep('Bisect Perf Regression')
   RunCmd([SrcPath('tools', 'prepare-bisect-perf-regression.py'),
           '-w', os.path.join(constants.DIR_SOURCE_ROOT, os.pardir)])
   RunCmd([SrcPath('tools', 'run-bisect-perf-regression.py'),
-          '-w', os.path.join(constants.DIR_SOURCE_ROOT, os.pardir),
-          '-p', bb_utils.GOMA_DIR])
+          '-w', os.path.join(constants.DIR_SOURCE_ROOT, os.pardir)])
 
 
 def GetHostStepCmds():
   return [
       ('compile', Compile),
       ('extract_build', ExtractBuild),
       ('check_webview_licenses', CheckWebViewLicenses),
       ('bisect_perf_regression', BisectPerfRegression),
       ('findbugs', FindBugs),
       ('zip_build', ZipBuild)
@@ skipping 18 matching lines @@
     return sys.exit('Unused args %s' % args)
 
   setattr(options, 'target', options.factory_properties.get('target', 'Debug'))
 
   if options.steps:
     bb_utils.RunSteps(options.steps.split(','), GetHostStepCmds(), options)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))