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There are several observers that have "OnStatusChanged" as a function
name. This change updates them to be more specific so that potential
listeners can implement the observers without any name conflicts.

Bug: 1106937
Change-Id: I111828f2d402b11daf2dca2b27df8f6a59786109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399130Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jimmy Gong <jimmyxgong@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805435}