Removed Settings.Global.LAST_ACTIVE_USER_ID.

This property was only used by Automotive and was added on frameworks/base
because it used be accessed by a class on frameworks/opt/services/car, but
it's now only accessed under packages/services/car (so it was moved to
CarSettings).

Test: atest SettingsBackupTest
Bug: 156567994

Change-Id: Idaff4a249600517c5250cd3821d75ce85fc9eeee

core/java/android/provider/Settings.java

@@ -14244,15 +14244,6 @@ public final class Settings {
          */
         public static final String KERNEL_CPU_THREAD_READER = "kernel_cpu_thread_reader";
 
-        /**
-         * Persistent user id that is last logged in to.
-         *
-         * They map to user ids, for example, 10, 11, 12.
-         *
-         * @hide
-         */
-        public static final String LAST_ACTIVE_USER_ID = "last_active_persistent_user_id";
-
         /**
          * Whether we've enabled native flags health check on this device. Takes effect on
          * reboot. The value "1" enables native flags health check; otherwise it's disabled.

packages/SettingsProvider/test/src/android/provider/SettingsBackupTest.java

@@ -316,7 +316,6 @@ public class SettingsBackupTest {
                     Settings.Global.KERNEL_CPU_THREAD_READER,
                     Settings.Global.LANG_ID_UPDATE_CONTENT_URL,
                     Settings.Global.LANG_ID_UPDATE_METADATA_URL,
-                    Settings.Global.LAST_ACTIVE_USER_ID,
                     Settings.Global.LOCATION_BACKGROUND_THROTTLE_INTERVAL_MS,
                     Settings.Global.LOCATION_BACKGROUND_THROTTLE_PROXIMITY_ALERT_INTERVAL_MS,
                     Settings.Global.LOCATION_BACKGROUND_THROTTLE_PACKAGE_WHITELIST,