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It was previously assumed that the WebViews owned by ManagedWebContents
would not be deleted before the Assistant view hierarchy in ash. As it
turns out, this is not always the case as identified by the reproduction
steps outlined in the attached bugs.

As such, we need to perform clean up safely whether ManagedWebContents
WebViews are destroyed before or after Assistant views in ash.

Bug: b:116821400, b:116814451
Change-Id: I982b327d45b22bcacef6e07489cb967eb36bcaf1
Reviewed-on: https://chromium-review.googlesource.com/c/1249569Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#596032}