Inline shouldDisableMediaOutput into Settings app

This allows the removal of a MediaRouter2Manager reference in
SettingsLib. Eventually, the inlined methods should be replaced with an
appropriate long-term alternative through SettingsLib.

This is a non-functional change.

Bug: 192657812
Test: Presubmit
Change-Id: I9f5dd6720fd95389335fec9e0689a40d88d30d46

src/com/android/settings/notification/RemoteVolumeGroupController.java

@@ -136,8 +136,11 @@ public class RemoteVolumeGroupController extends BasePreferenceController implem
 
             Preference switcherPreference = mPreferenceCategory.findPreference(
                     SWITCHER_PREFIX + info.getId());
-            final boolean isMediaOutputDisabled = mLocalMediaManager.shouldDisableMediaOutput(
-                    info.getClientPackageName());
+
+            // TODO: b/291277292 - Remove references to MediaRouter2Manager and implement long-term
+            //  solution in SettingsLib.
+            final boolean isMediaOutputDisabled =
+                    mRouterManager.getTransferableRoutes(info.getClientPackageName()).isEmpty();
             final CharSequence outputTitle = mContext.getString(R.string.media_output_label_title,
                     appName);
             if (switcherPreference != null) {