Remove dependency on AudioStub in ConnectionToClient

remoting/host/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")
 import("//build/config/ui.gni")
 import("//build/config/win/manifest.gni")
 import("//build/util/version.gni")
 import("//chrome/version.gni")
 import("//remoting/remoting_enable.gni")
@@ skipping 275 matching lines @@
       "//third_party/webrtc/modules/desktop_capture",
     ]
   }
 }
 
 # The host portions of the remoting unit tests.
 source_set("unit_tests") {
   testonly = true
 
   sources = [
-    "audio_pump_unittest.cc",
     "audio_silence_detector_unittest.cc",
     "backoff_timer_unittest.cc",
     "chromeos/aura_desktop_capturer_unittest.cc",
     "chromeos/clipboard_aura_unittest.cc",
     "chromoting_host_context_unittest.cc",
     "chromoting_host_unittest.cc",
     "client_session_unittest.cc",
     "config_file_watcher_unittest.cc",
     "daemon_process_unittest.cc",
     "desktop_process_unittest.cc",
@@ skipping 1351 matching lines @@
                       root_build_dir),
           rebase_path(outputs[0], root_build_dir),
         ]
       }
     } else {
       group("remoting_host_installation") {
       }
     }
   }
 }