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

webrtc/audio/BUILD.gn

 # Copyright (c) 2015 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.
 
 import("../webrtc.gni")
 if (is_android) {
@@ skipping 94 matching lines @@
     rtc_test("low_bandwidth_audio_test") {
       testonly = true
 
       sources = [
         "test/low_bandwidth_audio_test.cc",
         "test/low_bandwidth_audio_test.h",
       ]
 
       deps = [
         "../common_audio",
+        "../rtc_base:rtc_base_approved",
         "../system_wrappers",
         "../test:fake_audio_device",
         "../test:test_common",
         "../test:test_main",
         "//testing/gmock",
         "//testing/gtest",
-        "//third_party/gflags",
       ]
       if (is_android) {
         deps += [ "//testing/android/native_test:native_test_native_code" ]
       }
 
       data = [
         "../../resources/voice_engine/audio_tiny16.wav",
         "../../resources/voice_engine/audio_tiny48.wav",
         "../../resources/voice_engine/audio_dtx16.wav",
       ]
@@ skipping 22 matching lines @@
       "../common_audio",
       "../rtc_base:rtc_base_approved",
       "../system_wrappers",
       "../test:fake_audio_device",
       "../test:field_trial",
       "../test:single_threaded_task_queue",
       "../test:test_common",
       "../test:test_main",
       "//testing/gmock",
       "//testing/gtest",
-      "//third_party/gflags",
     ]
 
     data = [
       "//resources/voice_engine/audio_dtx16.wav",
     ]
 
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
 }