TODO about BatteryStats.STATS_SINCE deprecation

Test: None. Just a comment.
Change-Id: Ib60034998e1d4a374934842f6f86c04a13760d12

src/com/android/settings/fuelgauge/PowerUsageSummary.java

@@ -262,6 +262,8 @@ public class PowerUsageSummary extends PowerUsageBase implements OnLongClickList
         switch (item.getItemId()) {
             case MENU_STATS_TYPE:
                 if (mStatsType == BatteryStats.STATS_SINCE_CHARGED) {
+                    // TODO: STATS_SINCE_UNPLUGGED is deprecated in Q, so this accomplishes nothing,
+                    // but mStatsType doesn't seem to be hooked up to anything anyway.
                     mStatsType = BatteryStats.STATS_SINCE_UNPLUGGED;
                 } else {
                     mStatsType = BatteryStats.STATS_SINCE_CHARGED;