Previously everything lived in an inner class method of
SettingsRobolectricTestRunner. That method has now been turned into
a static method so that it can be called by other runners.
Bug: 62460102
Test: robotests
Change-Id: I6612b1f26404587301c534c8ba60e39d59d6c840
When auto time zone preference is not available, it should be considered
disabled, so that user can still select time zone.
Change-Id: I9b17205a11ff512da02694e3bce06cfbd21dd7db
Fix: 34203177
Test: make RunSettingsRoboTests
