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/wifi_endpoint_unittest.cc b/wifi_endpoint_unittest.cc
index a81dff4..f939e90 100644
--- a/wifi_endpoint_unittest.cc
+++ b/wifi_endpoint_unittest.cc
@@ -9,7 +9,7 @@
 #include <string>
 #include <vector>
 
-#include <base/stl_util-inl.h>
+#include <base/stl_util.h>
 #include <chromeos/dbus/service_constants.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>