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After https://chromium-review.googlesource.com/c/chromium/src/+/1140674
the GetSecureVerboseText function doesn't return text anymore. This
function is used for visual display. In order to continue getting data
for accessibility purposes, duplicate the function with modifications
to continue returning relevant info.
Additionally, fix iOS omnibox accessibility to 1) use this new function
and 2) update a11y when label (generally site url) changes even if
security state does not.

Bug: 869398
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ibf60a354d5f81b9a5d52aaec10d3ef5277be93bd
Reviewed-on: https://chromium-review.googlesource.com/1161913
Commit-Queue: Elodie Banel <lod@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582165}