[shill] Add code for persisting profiles and services to disk.

BUG=chromium-os:17253
TEST=unit

Change-Id: Ic6dbbcb10543da3f4615cb305a77f6b9b301e8bc
Reviewed-on: http://gerrit.chromium.org/gerrit/7633
Reviewed-by: Darin Petkov <petkov@chromium.org>
Tested-by: Chris Masone <cmasone@chromium.org>
diff --git a/dhcp_config_unittest.cc b/dhcp_config_unittest.cc
index d7ffbf5..9ca6592 100644
--- a/dhcp_config_unittest.cc
+++ b/dhcp_config_unittest.cc
@@ -343,7 +343,7 @@
                                            flimflam::kAddressProperty,
                                            PropertyStoreTest::kStringV,
                                            &error));
-  EXPECT_EQ(invalid_args_, error.name());
+  EXPECT_EQ(invalid_args(), error.name());
 }
 
 }  // namespace shill