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Flag for the new feature that allows user to add custom search engines in
settings.

Bug: 433824
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: If3b91e276b752b546013644119a5560f0a486314
Reviewed-on: https://chromium-review.googlesource.com/1236314
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Reviewed-by: Eric Noyau <noyau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593591}