Properly handle screen recorder shutdown in ChromotingHost.

remoting/host/chromoting_host.h

Index: remoting/host/chromoting_host.h
diff --git a/remoting/host/chromoting_host.h b/remoting/host/chromoting_host.h
index fb26aec8d349a36232596348a62d61012abe0ea1..bb9e80ed2df6b98a03bd9dee7d83d3641f2bc884 100644
--- a/remoting/host/chromoting_host.h
+++ b/remoting/host/chromoting_host.h
@@ -182,6 +182,9 @@ class ChromotingHost : public base::RefCountedThreadSafe<ChromotingHost>,
   void ProcessPreAuthentication(
       const scoped_refptr<protocol::ConnectionToClient>& connection);
 
+  void StopScreenRecorder();
+  void OnScreenRecorderStopped();
+
   // The following methods are called during shutdown.
   void ShutdownNetwork();
   void ShutdownRecorder();
@@ -212,6 +215,12 @@ class ChromotingHost : public base::RefCountedThreadSafe<ChromotingHost>,
   // and read by jingle thread.
   State state_;
 
+  // Number of screen recorders that are currently being
+  // stopped. Normally set to 0 or 1, but in some cases it may be
+  // greater than 1, particularly if when second client can connect
+  // immidiately after previous one disconnected.
+  int stopping_recorders_;
+
   // Lock is to lock the access to |state_|.
   base::Lock lock_;