Fix SecurityException while accessing Slice Uris

- There is SecurityException when accessing Slice Uris which are not in
  Settings app.
- Rollback to the original mechanism, remove an unused latch, and
  register a trivial callback

Fixes: 159195420
Test: robotest
Change-Id: Ice2cf5f928b0e6d0367bcc41c3912526e8f7bd7f

src/com/android/settings/homepage/contextualcards/EligibleCardChecker.java

@@ -110,9 +110,13 @@ public class EligibleCardChecker implements Callable<ContextualCard> {
     @VisibleForTesting
     Slice bindSlice(Uri uri) {
         final SliceViewManager manager = SliceViewManager.getInstance(mContext);
-        manager.pinSlice(uri);
+        final SliceViewManager.SliceCallback callback = slice -> { };
+
+        // Register a trivial callback to pin the slice
+        manager.registerSliceCallback(uri, callback);
         final Slice slice = manager.bindSlice(uri);
-        manager.unpinSlice(uri);
+        manager.unregisterSliceCallback(uri, callback);
+
         return slice;
     }