Access ChromotingHost::clients_ only on network thread.

remoting/protocol/session.h

Index: remoting/protocol/session.h
diff --git a/remoting/protocol/session.h b/remoting/protocol/session.h
index 27558d7b8da2d5e5496dcc42fd35efbc9d00df8d..432b94874e5c32f624ccecbe4b37c4dd9fd0365a 100644
--- a/remoting/protocol/session.h
+++ b/remoting/protocol/session.h
@@ -25,6 +25,11 @@ namespace protocol {
 // Generic interface for Chromotocol connection used by both client and host.
 // Provides access to the connection channels, but doesn't depend on the
 // protocol used for each channel.
+//
+// Because libjingle's sigslot class doesn't handle deletion properly
+// while it is being invoked all Session instances must be deleted
+// with a clean stack, i.e. not from event handlers, when sigslot may
+// be present in the stack.
 class Session : public base::NonThreadSafe {
  public:
   enum State {