Summary: Fix for https://github.com/facebook/flipper/issues/1300 The weak refs were not being cleared in two cases: - On config changes, isFinishing() would be false in onPause() - When calling finish() from Activity.onCreate(), onPause() isn't guaranteed to be called. ## Changelog Pull Request resolved: https://github.com/facebook/flipper/pull/1301 Reviewed By: mweststrate Differential Revision: D22286182 Pulled By: passy fbshipit-source-id: 948d1d9b2145b6526c0030cf537330409ff7f8c4