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The live region changed events are needed by current versions of JAWS,
which do not process the text inserted events fired by Chrome in all
modes. Specifically, current versions of JAWS processes text inserted
events in virtual cursor mode but not in focus mode. This may change
in future versions of JAWS, and so at some point the live region
changed events may truly become redundant with the text inserted events.

NOTRY=true

Bug: 878929
Change-Id: I3286c84d1d6366735a38af19e68f4c526658b68b
Reviewed-on: https://chromium-review.googlesource.com/1211508
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589412}