Bug: 135469195
Test: make RunSettingsRoboTests ROBOTEST_FILTER=PreferredNetworkModeContentObserverTest
make RunSettingsRoboTests ROBOTEST_FILTER=AutoSelectPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=OpenNetworkSelectPagePreferenceControllerTest
Change-Id: I5782ef67e429412ad0d6ad320e91bcdfe9c6b1db