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In some scenarios TranslateInfoBarDelegate gets destructed before the
TranslateInfobarController and subsequently its
TranslateInfoBarDelegateObserverBridge instance. This results in the
delegate reference to be invalid in the observer bridge's destructor.

TranslateInfoBarDelegate now notifies its observer before being so that it
can stop observing the instance.

Bug: 945433
Change-Id: I8b8644c66c84c3a4378f281d2937b931e3bd6f98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1536799
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644813}