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This is the last of a series of CLs that remove manual notifications
BrowserAccessibilityManager, now that it implements WebContentsObserver.
This CL removes manual BAM::Navigation{Succeeded,Failed} notifications
in favor of WCO::DidFinishNavigation, and BAM::UserIsNavigatingAway in
favor of WCO::DidStartLoading.

Bug: 981271
Change-Id: Ieca6ce0b97f2a0267fd7f2582ab1e333deb11b95
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1938489Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Farolino <dom@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720102}