Remove unused dbus.cc/.h and related things.

webrtc/build/webrtc.gni

 # 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("//build/config/arm.gni")
 import("//build/config/features.gni")
@@ skipping 39 matching lines @@
   rtc_build_libjpeg = true
   rtc_build_libsrtp = true
   rtc_build_libvpx = true
   rtc_libvpx_build_vp9 = true
   rtc_build_libyuv = true
   rtc_build_openmax_dl = true
   rtc_build_opus = true
   rtc_build_ssl = true
   rtc_build_usrsctp = true
 
-  # Disable by default.
-  rtc_have_dbus_glib = false
-
   # Enable to use the Mozilla internal settings.
   build_with_mozilla = false
 
   rtc_enable_android_opensl = false
 
   # Link-Time Optimizations.
   # Executes code generation at link-time instead of compile-time.
   # https://gcc.gnu.org/wiki/LinkTimeOptimization
   rtc_use_lto = false
 
@@ skipping 233 matching lines @@
                            ])
     configs += invoker.configs
     configs -= rtc_remove_configs
     configs -= invoker.suppressed_configs
     public_configs = [ rtc_common_inherited_config ]
     if (defined(invoker.public_configs)) {
       public_configs += invoker.public_configs
     }
   }
 }