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- Adds temporary fix to cr-dialog, to fix dialog title being vocalized
  twice by chromeVOX, this should be reversed when crbug.com/1139958 is
  closed.
- Add vocalization of signal strength icon

Bug: 1007433
Change-Id: I6a1dc2d8d37bc3e7e43097bcf2aa568c280152b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2480884
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Reviewed-by: John Lee <johntlee@chromium.org>
Reviewed-by: Regan Hsu <hsuregan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819219}