Hedger Wang 67002e8ae3 Clean up NavigationStateUtils ... Summary: == API Breaking Change == - Add unit tests to ensure that NavigationStateUtils does the right thing. - Remove the logics that lets NavigationStateUtils accept empty value as input and return a new state. - Remove the method `NavigationStateUtils.getParent`, `NavigationStateUtils.set`. These methods are rarely used and they can be replaced by other methods. Reviewed By: ericvicenti Differential Revision: D3374934 fbshipit-source-id: 0fdf538d014d7c5b4aa1f15a0ee8db9dc91e33cd		2016-06-08 15:13:31 -07:00
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NavigationStateUtils-test.js	Clean up NavigationStateUtils	2016-06-08 15:13:31 -07:00