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RenderFrameHostImpl::OnDetach() is not expected to be called for the
main frame. |parent| was not checked. It used to be checked in
FrameTree::RemoveFrame, but this function is no more used in OnDetach.

Bug: 902964
Change-Id: I8ec758dfcc7a382f3d3ec6554ea94ad857c5a6e3
Reviewed-on: https://chromium-review.googlesource.com/c/1348449
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610816}