Reduce visibility of ReactHost.stopSurface to package only (#38695)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/38695

Reduce visibility of ReactHost.stopSurface to package only

changelog: [internal] internal

Reviewed By: christophpurrer

Differential Revision: D47915446

fbshipit-source-id: 570c4d195b6f7a028aad8707a4149a94d8e9ca1d

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridgeless/ReactHost.java

@@ -239,17 +239,19 @@ public class ReactHost implements ReactHostInterface {
    * @param surface The surface to stop
    * @return A Task that will complete when stopSurface has been called.
    */
-  public Task<Boolean> stopSurface(final ReactSurface surface) {
+  /** package */
+  TaskInterface<Void> stopSurface(final ReactSurface surface) {
     final String method = "stopSurface(surfaceId = " + surface.getSurfaceID() + ")";
     log(method, "Schedule");
 
     detachSurface(surface);
     return callWithExistingReactInstance(
-        method,
-        reactInstance -> {
-          log(method, "Execute");
-          reactInstance.stopSurface(surface);
-        });
+            method,
+            reactInstance -> {
+              log(method, "Execute");
+              reactInstance.stopSurface(surface);
+            })
+        .makeVoid();
   }
 
   /**

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/bridgeless/ReactSurface.java

@@ -174,7 +174,7 @@ public class ReactSurface implements ReactSurfaceInterface {
           new IllegalStateException(
               "Trying to call ReactSurface.stop(), but no ReactHost is attached."));
     }
-    return host.stopSurface(this).makeVoid();
+    return host.stopSurface(this);
   }
 
   public int getSurfaceID() {