Error in 16 beta: undefined is not a function (evaluating 'owner.getName()')

This line is wrong in Fiber and crashes:

https://github.com/facebook/react/blob/58e6edeef61f5ab5b81530820571213161940d6a/src/renderers/native/findNodeHandle.js#L79

It should be changed to use getComponentName(owner).