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RenderWidgetHostViewGuest has been removed, so there is no longer a need
to check whether a RWHVAura is related to a guest. We also add a DCHECK
to ensure the view is not a child frame which would make this a bad cast.

Bug: 533069
Change-Id: Ie71f246d3a524865a1217dd4e1521a5c5c60c295
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017182Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734707}