Fix thread usage in chromoting host

remoting/host/session_manager.h

Index: remoting/host/session_manager.h
diff --git a/remoting/host/session_manager.h b/remoting/host/session_manager.h
index 9c8ad50d8d10edb79721a34019577c4bde78fea2..d624a356772efea0d9bcf7ee1fd832f003502c20 100644
--- a/remoting/host/session_manager.h
+++ b/remoting/host/session_manager.h
@@ -67,7 +67,7 @@ class SessionManager : public base::RefCountedThreadSafe<SessionManager> {
  public:
 
   // Construct a SessionManager. Message loops and threads are provided.
-  // Ownership of Capturer and Encoder are given to this object.
+  // This object does not own capturer and encoder.
   SessionManager(MessageLoop* capture_loop,
                  MessageLoop* encode_loop,
                  MessageLoop* network_loop,
@@ -95,6 +95,9 @@ class SessionManager : public base::RefCountedThreadSafe<SessionManager> {
   // Remove a client from receiving screen updates.
   void RemoveClient(scoped_refptr<ClientConnection> client);
 
+  // Remove all clients.
+  void RemoveAllClients();
+
  private:
 
   // Stores the data and information of a capture to pass off to the
@@ -130,6 +133,7 @@ class SessionManager : public base::RefCountedThreadSafe<SessionManager> {
   void DoSetMaxRate(double max_rate);
   void DoAddClient(scoped_refptr<ClientConnection> client);
   void DoRemoveClient(scoped_refptr<ClientConnection> client);
+  void DoRemoveAllClients();
   void DoRateControl();
 
   // Hepler method to schedule next capture using the current rate.
@@ -145,6 +149,10 @@ class SessionManager : public base::RefCountedThreadSafe<SessionManager> {
                                const scoped_refptr<media::DataBuffer>& data,
                                Encoder::EncodingState state);
 
+  // Getters for capturer and encoder.
+  Capturer* capturer();
+  Encoder* encoder();
+
   // Message loops used by this class.
   MessageLoop* capture_loop_;
   MessageLoop* encode_loop_;