Replace remaining gflags usages with rtc_base/flags

webrtc/voice_engine/BUILD.gn

 # Copyright (c) 2014 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")
 
@@ skipping 242 matching lines @@
         "../modules/rtp_rtcp:rtp_rtcp",
         "../modules/video_capture",
         "../rtc_base:rtc_base_approved",
         "../system_wrappers",
         "../system_wrappers/:system_wrappers_default",
         "../test/:test_common",
         "../test/:test_support",
         "../test/:video_test_common",
         "//testing/gmock",
         "//testing/gtest",
-        "//third_party/gflags",
       ]
 
       sources = [
         "test/auto_test/automated_mode.cc",
         "test/auto_test/fakes/conference_transport.cc",
         "test/auto_test/fakes/conference_transport.h",
         "test/auto_test/fakes/loudest_filter.cc",
         "test/auto_test/fakes/loudest_filter.h",
         "test/auto_test/fixtures/after_initialization_fixture.cc",
         "test/auto_test/fixtures/after_initialization_fixture.h",
@@ skipping 31 matching lines @@
         ]
       }
 
       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" ]
       }
     }
   }
 }