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If the active WebContents has a pending permission prompt when its
renderer crashes, and then the user closes the WebContents, the
following sequence of events takes place:
 1) The WebContents is detached from the Browser.
 2) This causes the WebView's crash overlay view to get torn down, and to
    make sure hit testing continues to work correctly on Mac, the hosted
    WebContents is made visible again temporarily.
 3) This triggers the PermissionRequestManager, which has pending requests,
    to show the prompt bubble again, but at this point there is no
    BrowserView to anchor the prompt to.

Make sure we silently suppress the prompt in step (3) as a quick fix.

Bug: 933321
Change-Id: If8dbf09e1faae33fc615e7a6117c155d5f8707c4
TBR: raymes@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1489245
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Kamila Hasanbega <hkamila@google.com>
Cr-Commit-Position: refs/heads/master@{#635975}