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CloseWidgetSoon will post DoDeferredClose, which will stop new frame
sinks from being made.

However WebPagePopupImpl destroys its Page/MainFrame etc when it calls
CloseWidgetSoon, which also detaches the WebFrameWidget. Then if a
RequestNewLayerTreeFrameSink was already in the task queue, it would
run before DoDeferredClose, and crash when it tries to get the URL from
the non-existant WebFrameWidget/MainFrame.

R=piman@chromium.org

Change-Id: I94ec48915b6dba207f783a9d3b380476e97da9da
Bug: 896836
Reviewed-on: https://chromium-review.googlesource.com/c/1342774Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609423}