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It appears to be possible for the guest view message filter to outlive
the BrowserContext during profile shutdown. We now observe this and
clear the filter's pointer to the BrowserContext.

We also now destroy the filter on the UI thread for simplicity. The
filter does not use weak pointers on the IO thread as a comment
previously claimed.

Bug: 1129705
Change-Id: If8483653d55c13cde0594e551ee27027060255af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419376
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809487}