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This reverts commit feb758c3.

Reason for revert: <INSERT REASONING HERE>
SpokenFeedbackTests failing on chromeos dbg
Original change's description:
> Only alert accessibility when a notification's text changes
> 
> Bug: 867426
> Change-Id: I7f220566f3e7a2b4ce7ef639d012f4323b762208
> Reviewed-on: https://chromium-review.googlesource.com/1166231
> Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
> Commit-Queue: David Tseng <dtseng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#581474}

TBR=stevenjb@chromium.org,dtseng@chromium.org

Change-Id: I8b23c03e08642caa7b05d2ce88e6f330dd056c37
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 867426
Reviewed-on: https://chromium-review.googlesource.com/1167603Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581607}