Replace gflags usages with rtc_base/flags in all targets based on test_main

webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_gencfgs.py

 #!/usr/bin/env python
 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Generate .json files with which the APM module can be tested using the
    apm_quality_assessment.py script.
 """
 
 import logging
 import os
 
 import quality_assessment.data_access as data_access
 
 OUTPUT_PATH = os.path.abspath('apm_configs')
 
 
 def _GenerateDefaultOverridden(config_override):
   """Generates one or more APM overriden configurations.
 
   For each item in config_override, it overrides the default configuration and
   writes a new APM configuration file.
 
   The default settings are loaded via "-all_default".
   Check "src/webrtc/modules/audio_processing/test/audioproc_float.cc" and search
-  for "if (FLAGS_all_default) {".
+  for "if (FLAG_all_default) {".
 
   For instance, in 55eb6d621489730084927868fed195d3645a9ec9 the default is this:
   settings.use_aec = rtc::Optional<bool>(true);
   settings.use_aecm = rtc::Optional<bool>(false);
   settings.use_agc = rtc::Optional<bool>(true);
   settings.use_bf = rtc::Optional<bool>(false);
   settings.use_ed = rtc::Optional<bool>(false);
   settings.use_hpf = rtc::Optional<bool>(true);
   settings.use_ie = rtc::Optional<bool>(false);
   settings.use_le = rtc::Optional<bool>(true);
@@ skipping 50 matching lines @@
 
 
 def main():
   logging.basicConfig(level=logging.INFO)
   _GenerateAllDefaultPlusOne()
   _GenerateAllDefaultButOne()
 
 
 if __name__ == '__main__':
   main()