GitLab

When a settings or snooze button handler of the MessageView deletes
|this| synchronously, we can't access any local fields anymore. This CL
fixes that by getting a weak ptr to check if |this| is still valid after
calling the MessageView.

Bug: None
Change-Id: I8153a4c56fe5b5c91eafd5f9d1cdbcbc3f58857a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2328858Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793562}