Misc clean up in search

- Remove updateFromClassNameResource() because it's just a no-op method.
- Simplify SearchIndexResources
- Update some pref pages to have unique keys.

Change-Id: I51e542d9947aafd046861ce7be0b4c7213fcd01d
Fixes: 64951285
Test: UniquePreferenceKeyTest
Test: robotest
Bug: 67852637

src/com/android/settings/accounts/AccountPreferenceController.java

@@ -54,7 +54,6 @@ import com.android.settings.Utils;
 import com.android.settings.core.PreferenceControllerMixin;
 import com.android.settings.core.instrumentation.MetricsFeatureProvider;
 import com.android.settings.overlay.FeatureFactory;
-import com.android.settings.search.SearchFeatureProviderImpl;
 import com.android.settings.search.SearchIndexableRaw;
 import com.android.settingslib.RestrictedPreference;
 import com.android.settingslib.accounts.AuthenticatorHelper;
@@ -346,8 +345,6 @@ public class AccountPreferenceController extends AbstractPreferenceController
                 DISALLOW_MODIFY_ACCOUNTS, userInfo.id);
         }
         mProfiles.put(userInfo.id, profileData);
-        new SearchFeatureProviderImpl().getIndexingManager(mContext).updateFromClassNameResource(
-                UserAndAccountDashboardFragment.class.getName(), true /* includeInSearchResults */);
     }
 
     private DimmableIconPreference newAddAccountPreference(Context context) {