Fix classes that have too many virtuals for inline constructors.

remoting/host/host_status_observer.h

Index: remoting/host/host_status_observer.h
diff --git a/remoting/host/host_status_observer.h b/remoting/host/host_status_observer.h
index eec5a5110a758ac62d6de0512e0a6295bc032a0b..2d48be751dcd5e77227c2eabcd79ea2576001b26 100644
--- a/remoting/host/host_status_observer.h
+++ b/remoting/host/host_status_observer.h
@@ -23,7 +23,6 @@ struct TransportRoute;
 // on receipt of these callbacks; they are purely informational.
 class HostStatusObserver {
  public:
-  HostStatusObserver() { }
   virtual ~HostStatusObserver() { }
 
   // Called when an unauthorized user attempts to connect to the host.
@@ -49,6 +48,9 @@ class HostStatusObserver {
 
   // Called when the host shuts down.
   virtual void OnShutdown() {}
+
+ protected:
+  HostStatusObserver() {}
 };
 
 }  // namespace remoting