Change design to avoid using Robolectric.setupActivity()
Bug: 140707056
Test: make RunSettingsRoboTests ROBOTEST_FILTER=EuiccPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=DataServiceSetupPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=ApnPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=MobileNetworkActivityTest
make RunSettingsRoboTests ROBOTEST_FILTER=DataUsagePreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=ApnEditorTest
make RunSettingsRoboTests ROBOTEST_FILTER=MobileNetworkSummaryControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=SubscriptionsPreferenceControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=MobileNetworkListControllerTest
make RunSettingsRoboTests ROBOTEST_FILTER=MobileNetworkPreferenceControllerTest
Change-Id: Ifacd2e6c8733d8e814a277cf34d6f7eb1a9ddba4