Remove CommandLine dependency from the Linux's AudioCapturer.

remoting/host/audio_capturer_mac.cc

 // Copyright (c) 2012 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.
 
 #include "base/logging.h"
 #include "remoting/host/audio_capturer.h"
 
 namespace remoting {
 
-bool AudioCapturer::IsSupported() {
+bool AudioCapturer::IsSupported(ChromotingHostContext* context) {
   return false;
 }
 
-scoped_ptr<AudioCapturer> AudioCapturer::Create() {
+scoped_ptr<AudioCapturer> AudioCapturer::Create(
+    ChromotingHostContext* context) {
   NOTIMPLEMENTED();
   return scoped_ptr<AudioCapturer>(NULL);
 }
 
 }  // namespace remoting