Update CRD ChromeOS Host build files to be better in line with GN style.

remoting/host/audio_capturer_chromeos.cc

Index: remoting/host/audio_capturer_chromeos.cc
diff --git a/remoting/host/audio_capturer_chromeos.cc b/remoting/host/audio_capturer_chromeos.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3e36317e1682b70a4292094a16fea47561d4b87a
--- /dev/null
+++ b/remoting/host/audio_capturer_chromeos.cc
@@ -0,0 +1,19 @@
+// Copyright (c) 2017 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() {
+  return false;
+}
+
+std::unique_ptr<AudioCapturer> AudioCapturer::Create() {
+  NOTIMPLEMENTED();
+  return nullptr;
+}
+
+}  // namespace remoting