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* Return an empty list with S_OK, not S_FALSE, as this lets the screen
reader process the end of the range of text.

* Repeat previous text attributes when toggling aria-invalid:spelling
in the next text range

Bug: 944645
Change-Id: I89d7599ee282dd325e3ccee13ad3bd3ee5447552
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1539920Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644822}