Remove redundant methods and refactor

Remove the summary method and write the code in AOSP directly instead to
force string consistency. Also refactor a bit after the modification.

Fixes: 276399056
Test: robotests
Change-Id: I76ad740b694363a3cdfb3748e41c840fb678b93d

tests/unit/src/com/android/settings/testutils/FakeFeatureFactory.java

@@ -157,7 +157,7 @@ public class FakeFeatureFactory extends FeatureFactory {
     }
 
     @Override
-    public BatterySettingsFeatureProvider getBatterySettingsFeatureProvider(Context context) {
+    public BatterySettingsFeatureProvider getBatterySettingsFeatureProvider() {
         return batterySettingsFeatureProvider;
     }