Clean listeners during destroy of ReactContext

Summary:
This diff cleans listeners on the destruction of the ReactContext.

changelog: [inernal] internal

Reviewed By: JoshuaGross

Differential Revision: D26259929

fbshipit-source-id: 1843cabdac2fa3e67dcc890afd923b82472d8f66

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

@@ -23,6 +23,7 @@ import com.facebook.react.bridge.queue.MessageQueueThread;
 import com.facebook.react.bridge.queue.ReactQueueConfiguration;
 import com.facebook.react.common.LifecycleState;
 import com.facebook.react.common.ReactConstants;
+import com.facebook.react.config.ReactFeatureFlags;
 import java.lang.ref.WeakReference;
 import java.util.concurrent.CopyOnWriteArraySet;
 
@@ -296,6 +297,11 @@ public class ReactContext extends ContextWrapper {
     if (mCatalystInstance != null) {
       mCatalystInstance.destroy();
     }
+    if (ReactFeatureFlags.enableReactContextCleanupFix) {
+      mLifecycleEventListeners.clear();
+      mActivityEventListeners.clear();
+      mWindowFocusEventListeners.clear();
+    }
   }
 
   /** Should be called by the hosting Fragment in {@link Fragment#onActivityResult} */