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This CL adds the accessibility labels and ordering for the popup menus.

Bug: 833425, 842032, 831587
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I06bd6821144aee96c47374fd44e4a811831fc704
Reviewed-on: https://chromium-review.googlesource.com/1057307
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558325}