Generalize JavaOnlyMap's getMap

Reviewed By: mdvacca

Differential Revision: D7165678

fbshipit-source-id: 3dd88b24c89af369c9d5f3cc57c96f29c4f10d47

ReactAndroid/src/main/java/com/facebook/react/bridge/JavaOnlyMap.java

@@ -107,8 +107,8 @@ public class JavaOnlyMap implements ReadableMap, WritableMap {
   }
 
   @Override
-  public JavaOnlyMap getMap(String name) {
-    return (JavaOnlyMap) mBackingMap.get(name);
+  public ReadableMap getMap(String name) {
+    return (ReadableMap) mBackingMap.get(name);
   }
 
   @Override