Move Shill property utility functions to a new separate file.

chromeos/network/favorite_state.cc

Index: chromeos/network/favorite_state.cc
diff --git a/chromeos/network/favorite_state.cc b/chromeos/network/favorite_state.cc
index 2bc6b8ef7bd7ca580a05e989729db31abc405559..be645acdcb2d4de64b1aae65033b540786413e57 100644
--- a/chromeos/network/favorite_state.cc
+++ b/chromeos/network/favorite_state.cc
@@ -10,6 +10,7 @@
 #include "chromeos/network/network_event_log.h"
 #include "chromeos/network/network_profile_handler.h"
 #include "chromeos/network/network_state.h"
+#include "chromeos/network/shill_property_util.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
 namespace chromeos {
@@ -28,7 +29,7 @@ bool FavoriteState::PropertyChanged(const std::string& key,
   if (key == flimflam::kProfileProperty) {
     return GetStringValue(key, value, &profile_path_);
   } else if (key == flimflam::kUIDataProperty) {
-    if (!NetworkState::GetUIDataFromValue(value, &ui_data_)) {
+    if (!shill_property_util::GetUIDataFromValue(value, &ui_data_)) {
       NET_LOG_ERROR("Failed to parse " + key, path());
       return false;
     }