Remove duplicate preferences in Accessibility settings.

- addPreferencesFromResource() call has been added to
InstrumentedPreferenceFragment, and hence sub-class should not call it
again.

Change-Id: Ia016d9d407ac3f838c962d1ced585647382a051a
Fixes: 68820835
Test: make RunSettingsRoboTests

src/com/android/settings/datausage/UnrestrictedDataAccess.java

@@ -59,7 +59,9 @@ public class UnrestrictedDataAccess extends SettingsPreferenceFragment
     public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
         setAnimationAllowed(true);
-        addPreferencesFromResource(R.xml.unrestricted_data_access_settings);
+        if (!usePreferenceScreenTitle()) {
+            addPreferencesFromResource(R.xml.unrestricted_data_access_settings);
+        }
         mApplicationsState = ApplicationsState.getInstance(
                 (Application) getContext().getApplicationContext());
         mDataSaverBackend = new DataSaverBackend(getContext());
@@ -208,6 +210,11 @@ public class UnrestrictedDataAccess extends SettingsPreferenceFragment
         return MetricsEvent.DATA_USAGE_UNRESTRICTED_ACCESS;
     }
 
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.unrestricted_data_access_settings;
+    }
+
     @Override
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         if (preference instanceof AccessPreference) {