Always run PolicyWatcher on UI thread in It2Me host.

remoting/host/it2me/it2me_host.h

Index: remoting/host/it2me/it2me_host.h
diff --git a/remoting/host/it2me/it2me_host.h b/remoting/host/it2me/it2me_host.h
index c7fa60e4632e12dd72af5ca52c5fc4644ebb59f4..cbc835c5f06944c14f526e8540d5701412693250 100644
--- a/remoting/host/it2me/it2me_host.h
+++ b/remoting/host/it2me/it2me_host.h
@@ -132,10 +132,6 @@ class It2MeHost : public base::RefCountedThreadSafe<It2MeHost>,
   // the UI thread.
   void ShutdownOnUiThread();
 
-  // Called when |policy_watcher_| has stopped listening for changes and it is
-  // safe to delete it.
-  void OnPolicyWatcherShutdown();
-
   // Called when initial policies are read, and when they change.
   void OnPolicyUpdate(scoped_ptr<base::DictionaryValue> policies);