Remove references to BatteryStatsHelper from PowerUsageBase

Bug: 180630447
Bug: 173745486

Test: make RunSettingsRoboTests
Test: male RunSettingsGoogleRoboTests
Change-Id: Ifed69c4fdd741f75b0b962f9d3200f0ed533358f

tests/robotests/src/com/android/settings/fuelgauge/PowerUsageBaseTest.java

@@ -27,7 +27,6 @@ import android.os.Bundle;
 
 import androidx.loader.app.LoaderManager;
 
-import com.android.internal.os.BatteryStatsHelper;
 import com.android.settings.testutils.shadow.ShadowDashboardFragment;
 import com.android.settingslib.core.AbstractPreferenceController;
 
@@ -45,8 +44,6 @@ import java.util.List;
 @Config(shadows = ShadowDashboardFragment.class)
 public class PowerUsageBaseTest {
 
-    @Mock
-    private BatteryStatsHelper mBatteryStatsHelper;
     @Mock
     private LoaderManager mLoaderManager;
     private TestFragment mFragment;
@@ -56,7 +53,6 @@ public class PowerUsageBaseTest {
         MockitoAnnotations.initMocks(this);
 
         mFragment = spy(new TestFragment());
-        mFragment.setBatteryStatsHelper(mBatteryStatsHelper);
         doReturn(mLoaderManager).when(mFragment).getLoaderManager();
     }
 
@@ -98,9 +94,5 @@ public class PowerUsageBaseTest {
         protected List<AbstractPreferenceController> createPreferenceControllers(Context context) {
             return null;
         }
-
-        private void setBatteryStatsHelper(BatteryStatsHelper batteryStatsHelper) {
-            mStatsHelper = batteryStatsHelper;
-        }
     }
 }