Remove DeviceManager files from third_party/libjingle build configs.

third_party/libjingle/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 
 # From third_party/libjingle/libjingle.gyp's target_defaults.
 config("jingle_unexported_configs") {
   defines = [
     "EXPAT_RELATIVE_PATH",
@@ skipping 386 matching lines @@
       "../webrtc/media/base/videobroadcaster.cc",
       "../webrtc/media/base/videobroadcaster.h",
       "../webrtc/media/base/videocapturer.cc",
       "../webrtc/media/base/videocapturer.h",
       "../webrtc/media/base/videocommon.cc",
       "../webrtc/media/base/videocommon.h",
       "../webrtc/media/base/videoframe.cc",
       "../webrtc/media/base/videoframe.h",
       "../webrtc/media/base/videoframefactory.cc",
       "../webrtc/media/base/videoframefactory.h",
-      "../webrtc/media/devices/dummydevicemanager.cc",
-      "../webrtc/media/devices/dummydevicemanager.h",
       "../webrtc/media/engine/webrtccommon.h",
       "../webrtc/media/engine/webrtcvideoframe.cc",
       "../webrtc/media/engine/webrtcvideoframe.h",
       "../webrtc/media/engine/webrtcvideoframefactory.cc",
       "../webrtc/media/engine/webrtcvideoframefactory.h",
       "../webrtc/media/engine/webrtcvoe.h",
       "../webrtc/pc/audiomonitor.cc",
       "../webrtc/pc/audiomonitor.h",
       "../webrtc/pc/bundlefilter.cc",
       "../webrtc/pc/bundlefilter.h",
@@ skipping 77 matching lines @@
       "$p2p_dir/stunprober/stunprober.cc",
     ]
 
     deps = [
       ":libjingle_webrtc_common",
       "//third_party/webrtc/base:rtc_base",
     ]
   }
 }  # enable_webrtc
 # TODO(GYP): Port libjingle.gyp's enable_webrtc condition block.