Remove hard-coded custom sources from MediaSource

Bug: 140231766
Test: Manual
Change-Id: I64dad529cc7583dd90c5f32b009e2a8a5566de3d
diff --git a/car-media-common/src/com/android/car/media/common/source/MediaSource.java b/car-media-common/src/com/android/car/media/common/source/MediaSource.java
index db2cc11..09dcbb5 100644
--- a/car-media-common/src/com/android/car/media/common/source/MediaSource.java
+++ b/car-media-common/src/com/android/car/media/common/source/MediaSource.java
@@ -38,10 +38,8 @@
 
 import com.android.car.apps.common.BitmapUtils;
 
-import java.util.HashSet;
 import java.util.List;
 import java.util.Objects;
-import java.util.Set;
 
 /**
  * This represents a source of media content. It provides convenient methods to access media source
@@ -50,15 +48,6 @@
 public class MediaSource {
     private static final String TAG = "MediaSource";
 
-    /**
-     * Custom media sources which should not be templatized.
-     */
-    private static final Set<String> CUSTOM_MEDIA_SOURCES = new HashSet<>();
-
-    static {
-        CUSTOM_MEDIA_SOURCES.add("com.android.car.radio");
-    }
-
     @NonNull
     private final ComponentName mBrowseService;
     @NonNull
@@ -201,13 +190,6 @@
         return getRoundCroppedBitmap(BitmapUtils.fromDrawable(mIcon, null));
     }
 
-    /**
-     * Returns {@code true} iff this media source should not be templatized.
-     */
-    public boolean isCustom() {
-        return CUSTOM_MEDIA_SOURCES.contains(getPackageName());
-    }
-
     private static Bitmap getRoundCroppedBitmap(Bitmap bitmap) {
         Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),
                 Bitmap.Config.ARGB_8888);