update_engine: Rename "chromeos" -> "brillo" in include paths and namespaces

libchromeos is transitioning to libbrillo and chromeos namespaces
and include directory is changing to brillo.

Bug: 24872993
Change-Id: I770659a95be380a50fe3b2ba9f91d65818f40945
diff --git a/update_manager/real_shill_provider.h b/update_manager/real_shill_provider.h
index aca4bae..5f3f6bf 100644
--- a/update_manager/real_shill_provider.h
+++ b/update_manager/real_shill_provider.h
@@ -69,7 +69,7 @@
  private:
   // A handler for ManagerProxy.PropertyChanged signal.
   void OnManagerPropertyChanged(const std::string& name,
-                                const chromeos::Any& value);
+                                const brillo::Any& value);
 
   // Called when the signal in ManagerProxy.PropertyChanged is connected.
   void OnSignalConnected(const std::string& interface_name,