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This change removes the unnecessary navigation stop on the "Add
Connection" cr-expand-button. Previously, this was read by ChromeVox as
first stop: "Add connection", second stop: "Add network connection,
[Expanded|Collapsed], Button". Now, only the second stop will be read.

Bug: 1012565
Change-Id: I42ac19da1d3813cf17830c340c7ef883c2e7ab91
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915089Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Auto-Submit: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715409}