Remove dependency on AudioStub in ConnectionToClient

remoting/protocol/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")
 
 static_library("protocol") {
   sources = [
+    "audio_pump.cc",
+    "audio_pump.h",
     "audio_reader.cc",
     "audio_reader.h",
     "audio_stub.h",
     "audio_writer.cc",
     "audio_writer.h",
     "auth_util.cc",
     "auth_util.h",
     "authenticator.cc",
     "authenticator.h",
     "capability_names.h",
@@ skipping 242 matching lines @@
   public_deps = [
     ":protocol",
     "//testing/gmock",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
+    "audio_pump_unittest.cc",
     "authenticator_test_base.cc",
     "authenticator_test_base.h",
     "capture_scheduler_unittest.cc",
     "channel_multiplexer_unittest.cc",
     "channel_socket_adapter_unittest.cc",
     "chromium_socket_factory_unittest.cc",
     "client_video_dispatcher_unittest.cc",
     "clipboard_echo_filter_unittest.cc",
     "clipboard_filter_unittest.cc",
     "connection_tester.cc",
@@ skipping 25 matching lines @@
     "webrtc_transport_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }