Remove webrtc::Config from ViEChannelGroup.

webrtc/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.
 
 # TODO(kjellander): Rebase this to webrtc/build/common.gypi changes after r6330.
 
@@ skipping 153 matching lines @@
       "-fno-builtin-cosf",
       "-fno-builtin-sinf",
     ]
   }
 }
 
 source_set("webrtc") {
   sources = [
     "call.h",
     "config.h",
-    "experiments.h",
     "frame_callback.h",
     "transport.h",
   ]
 
   configs += [ ":common_config" ]
   public_configs = [ ":common_inherited_config" ]
 
   deps = [
     ":webrtc_common",
     "base:rtc_base",
@@ skipping 48 matching lines @@
 
   configs += [ ":common_config" ]
   public_configs = [ ":common_inherited_config" ]
 }
 
 source_set("gtest_prod") {
   sources = [
     "test/testsupport/gtest_prod_util.h",
   ]
 }