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This allows a consumer to call SetAccessibleName multiple times and
have the new name be reflected in ChromeVox.

Bug: 719015
Change-Id: If355c3988907f67f336255a9b146e742e44bf9e2
Reviewed-on: https://chromium-review.googlesource.com/709921Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521172}