Introduced base class for WebRTC browser tests, cleaned up duplication.

chrome/chrome_tests.gypi

 # 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1431 matching lines @@
         'browser/infobars/infobars_browsertest.cc',
         'browser/loadtimes_extension_bindings_browsertest.cc',
         'browser/locale_tests_browsertest.cc',
         'browser/logging_chrome_browsertest.cc',
         'browser/managed_mode/managed_mode_browsertest.cc',
         'browser/managed_mode/managed_mode_resource_throttle_browsertest.cc',
         'browser/managed_mode/managed_user_service_browsertest.cc',
         'browser/media/chrome_media_stream_infobar_browsertest.cc',
         'browser/media/chrome_webrtc_browsertest.cc',
         'browser/media/chrome_webrtc_video_quality_browsertest.cc',
+        'browser/media/webrtc_browsertest_base.cc',
         'browser/media/webrtc_browsertest_common.cc',
         'browser/media_galleries/fileapi/itunes_finder_win_browsertest.cc',
         'browser/media_galleries/fileapi/media_file_validator_unittest.cc',
         'browser/media_galleries/media_galleries_dialog_controller_mock.cc',
         'browser/media_galleries/media_galleries_dialog_controller_mock.h',
         'browser/metrics/metrics_service_browsertest.cc',
         'browser/net/cookie_policy_browsertest.cc',
         'browser/net/dns_probe_browsertest.cc',
         'browser/net/ftp_browsertest.cc',
         'browser/net/load_timing_browsertest.cc',
@@ skipping 1930 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }