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TargetAutoAttacher::UpdatePortals currently adds all inner WebContents
including guest views. When devtools closes, SetAutoAttach clears
|auto_attached_hosts_| of any portals, but leaves any guest views which
leads to the failed DCHECK that all auto attached hosts have been
removed.

Now in UpdatePortals, we check that the inner contents is a portal
before adding it.

Bug: 961113
Change-Id: I758b3818c3f390f47c4020d88094387ee85d07e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1777022Reviewed-by: Lucas Gadani <lfg@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692179}