Tiny little refactoring of DesktopEnvironment.

remoting/host/ipc_audio_capturer.cc

Index: remoting/host/ipc_audio_capturer.cc
diff --git a/remoting/host/ipc_audio_capturer.cc b/remoting/host/ipc_audio_capturer.cc
index 17c478ec286acbf39188fec7602b3478f020b6c1..51d6c769ef9598f0f031a09e346b997c8b8830ac 100644
--- a/remoting/host/ipc_audio_capturer.cc
+++ b/remoting/host/ipc_audio_capturer.cc
@@ -11,7 +11,8 @@ namespace remoting {
 
 IpcAudioCapturer::IpcAudioCapturer(
     scoped_refptr<DesktopSessionProxy> desktop_session_proxy)
-    : desktop_session_proxy_(desktop_session_proxy) {
+    : desktop_session_proxy_(desktop_session_proxy),
+      started_(false) {
   // The audio capturer is created on the network thread while used on the audio
   // capture thread. Detach |thread_checker_| from the current thread so that it
   // will re-attach to the proper thread when Start() is called for the first
@@ -20,40 +21,31 @@ IpcAudioCapturer::IpcAudioCapturer(
 }
 
 IpcAudioCapturer::~IpcAudioCapturer() {
-  DCHECK(callback_.is_null());
+  DCHECK(!started_);
 }
 
 bool IpcAudioCapturer::Start(const PacketCapturedCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(callback_.is_null());
-  DCHECK(!callback.is_null());
+  DCHECK(!started_);
 
-  callback_ = callback;
-  desktop_session_proxy_->StartAudioCapturer(this);
+  started_ = true;
+  desktop_session_proxy_->StartAudioCapturer(callback);
 
   return true;
 }
 
 void IpcAudioCapturer::Stop() {
   DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(!callback_.is_null());
+  DCHECK(started_);
 
   desktop_session_proxy_->StopAudioCapturer();
-  callback_.Reset();
+  started_ = false;
 }
 
 bool IpcAudioCapturer::IsStarted() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  return !callback_.is_null();
-}
-
-// Called when an audio packet has been received.
-void IpcAudioCapturer::OnAudioPacket(scoped_ptr<AudioPacket> packet) {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(!callback_.is_null());
-
-  callback_.Run(packet.Pass());
+  return started_;
 }
 
 }  // namespace remoting