commit 7f2d6ce0586dc33f075b1d5733b3715eb3dd4f0c
author Zhen Zhang <zzhen@google.com> Sun Mar 15 11:18:01 2020 -0700
committer Zhen Zhang <zzhen@google.com> Fri Mar 20 13:15:10 2020 -0700
tree f9697413c9790bdf863125bfc5b792c27c843ee6
parent f5ff928958cb10ca35cdd1c9fbf68b0af9cc3dd0

Refactor new tether settings to remove SharedPreferences

Bluetooth, USB and Wifi Disable tether preferences will turn on/off that
type of tethering interface instantly without storing it into
SharedPreferences. They are listening to TetherEnabler to update their
state.
Refactored to remove dependancy on SharedPreferences.

Bug: 151367756
Test: TetherEnablerTest; BluetoothTetherPreferenceControllerTest;
UsbTetherPreferenceControllerTest;
WifiTetherDisablePreferenceControllerTest; AllInOneSettingsTest;
AllInOneTetherPreferenceControllerTest

Change-Id: Ia6cc60bc4de8f08413beb6d41552a18f6fa6a55b