shill: Convert code to use the newest version of libchrome.

The biggest change is a switch from using the deprecated
Task and CallbackN mechanisms to using the new Callback
mechanism.

Note: Original CL was https://gerrit.chromium.org/gerrit/16156.
This is logically another patch to that CL, but since the
latter was already merged, and is considered closed by
Gerrit, it's necessary to create a new CL.

BUG=chromium-os:15330
TEST=Build shill and run it on a zgb with a modem. Build and
run unit tests.
CQ-DEPEND=I37628863370323d30cac493764ea28f8ffd42637

Change-Id: I3ae78a3aa44ec167b79f2170d07650ece888254f
Reviewed-on: https://gerrit.chromium.org/gerrit/18030
Reviewed-by: Eric Shienbrood <ers@chromium.org>
Tested-by: Eric Shienbrood <ers@chromium.org>
Commit-Ready: Eric Shienbrood <ers@chromium.org>
diff --git a/device.h b/device.h
index afa900d..0c7f22d 100644
--- a/device.h
+++ b/device.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include <base/basictypes.h>
+#include <base/callback.h>
 #include <base/memory/ref_counted.h>
 #include <base/memory/scoped_ptr.h>
 #include <gtest/gtest_prod.h>  // for FRIEND_TEST
@@ -262,8 +263,8 @@
   ConnectionRefPtr connection_;
   scoped_ptr<DeviceAdaptorInterface> adaptor_;
   scoped_ptr<PortalDetector> portal_detector_;
-  scoped_ptr<Callback1<const PortalDetector::Result &>::Type>
-              portal_detector_callback_;
+  base::Callback<void(const PortalDetector::Result &)>
+      portal_detector_callback_;
   Technology::Identifier technology_;
 
   // Maintain a reference to the connected / connecting service