Clear unused field mPowerUsageFeatureProvider in PowerUsageAdvanced.

Bug: 256123455
Test: presubmit
Change-Id: Ia22eb8d11836b9b0d8ab74f4760e81966040a947
diff --git a/src/com/android/settings/fuelgauge/batteryusage/PowerUsageAdvanced.java b/src/com/android/settings/fuelgauge/batteryusage/PowerUsageAdvanced.java
index 805821f..c7cf70e 100644
--- a/src/com/android/settings/fuelgauge/batteryusage/PowerUsageAdvanced.java
+++ b/src/com/android/settings/fuelgauge/batteryusage/PowerUsageAdvanced.java
@@ -34,8 +34,6 @@
 import com.android.settings.R;
 import com.android.settings.SettingsActivity;
 import com.android.settings.fuelgauge.BatteryBroadcastReceiver;
-import com.android.settings.fuelgauge.PowerUsageFeatureProvider;
-import com.android.settings.overlay.FeatureFactory;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settingslib.core.AbstractPreferenceController;
 import com.android.settingslib.search.SearchIndexable;
@@ -61,7 +59,6 @@
             new BatteryHistoryLoaderCallbacks();
 
     private boolean mIsChartDataLoaded = false;
-    private PowerUsageFeatureProvider mPowerUsageFeatureProvider;
     private BatteryChartPreferenceController mBatteryChartPreferenceController;
 
     private final ContentObserver mBatteryObserver =
@@ -78,9 +75,7 @@
     @Override
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
-        final Context context = getContext();
-        refreshFeatureFlag(context);
-        mHistPref = (BatteryHistoryPreference) findPreference(KEY_BATTERY_CHART);
+        mHistPref = findPreference(KEY_BATTERY_CHART);
         setBatteryChartPreferenceController();
     }
 
@@ -130,7 +125,6 @@
 
     @Override
     protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
-        refreshFeatureFlag(context);
         final List<AbstractPreferenceController> controllers = new ArrayList<>();
         mBatteryChartPreferenceController =
                 new BatteryChartPreferenceController(
@@ -176,13 +170,6 @@
         }
     }
 
-    private void refreshFeatureFlag(Context context) {
-        if (mPowerUsageFeatureProvider == null) {
-            mPowerUsageFeatureProvider = FeatureFactory.getFactory(context)
-                    .getPowerUsageFeatureProvider(context);
-        }
-    }
-
     private void setBatteryChartPreferenceController() {
         if (mHistPref != null && mBatteryChartPreferenceController != null) {
             mHistPref.setChartPreferenceController(mBatteryChartPreferenceController);