Change --gtest-filter argument to --gtest_filter

ios/build/bots/scripts/test_runner.py

 # Copyright 2016 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.
 
 """Test runners for iOS."""
 
 import argparse
 import collections
 import errno
 import os
@@ skipping 733 matching lines @@
       'idevice-app-runner',
       '--udid', self.udid,
       '--start', self.cfbundleid,
     ]
     args = []
 
     if test_filter:
       kif_filter = get_kif_test_filter(test_filter, invert=invert)
       gtest_filter = get_gtest_filter(test_filter, invert=invert)
       cmd.extend(['-D', 'GKIF_SCENARIO_FILTER=%s' % kif_filter])
-      args.append('--gtest-filter=%s' % gtest_filter)
+      args.append('--gtest_filter=%s' % gtest_filter)
 
     for env_var in self.env_vars:
       cmd.extend(['-D', env_var])
 
     if args or self.test_args:
       cmd.append('--args')
       cmd.extend(self.test_args)
       cmd.extend(args)
 
     return cmd
 
   def get_launch_env(self):
     """Returns a dict of environment variables to use to launch the test app.
 
     Returns:
       A dict of environment variables.
     """
     env = super(DeviceTestRunner, self).get_launch_env()
     if self.xctest_path:
       env['NSUnbufferedIO'] = 'YES'
       # e.g. ios_web_shell_egtests
       env['APP_TARGET_NAME'] = os.path.splitext(
           os.path.basename(self.app_path))[0]
       # e.g. ios_web_shell_egtests_module
       env['TEST_TARGET_NAME'] = env['APP_TARGET_NAME'] + '_module'
     return env