Revert "Migrating SettingsLib tests to /external/robolectic."

Revert submission 23845147-cherrypick-settings_on_latest_robo_udc-dev-tnloigxoz8b

Reason for revert: Breaking SettingsRoboTests as it's an dependency

Reverted changes: /q/submissionid:23845147-cherrypick-settings_on_latest_robo_udc-dev-tnloigxoz8b

Change-Id: I9707baab16a6428ec546766e4ff6f5a112ecd13f
29 files changed