Re-land "[shill] Add hardware address to Device objects."

Forgot some headers...

BUG=chromium-os:17744
TEST=unit

This reverts commit 0fda552b0fec3498403336acb9e89dd7799cac74.

Change-Id: I1cd05e47d29bc7ea2a065cabf1d81dd37f74c0f8
Reviewed-on: http://gerrit.chromium.org/gerrit/6270
Reviewed-by: Chris Masone <cmasone@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
diff --git a/manager.h b/manager.h
index 5f6f925..9a4aa47 100644
--- a/manager.h
+++ b/manager.h
@@ -65,8 +65,8 @@
   ServiceRefPtr FindService(const std::string& name);
   std::vector<std::string> EnumerateAvailableServices();
 
-  DeviceInfo *device_info() { return &device_info_; }
-  PropertyStore *store() { return &store_; }
+  virtual DeviceInfo *device_info() { return &device_info_; }
+  virtual PropertyStore *store() { return &store_; }
 
  private:
   friend class ManagerAdaptorInterface;