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This change ensures that the server-supplied default visibility hint
for suggestion groups is respected on Android.

Suggestion groups will appear collapsed if the server hints their
initial state should be hidden.

The change also repurposes (and subsequently renames)
AutocompleteResult's GroupHeaders as GroupsDetails.

Bug: 1113931
Change-Id: Ib9214eecf8f3939bb08098a05180281ecf20f21e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341822
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797047}