So, this flag is no longer in my version of Chrome Dev (and Chrome Release) on openSuse Linux.
It’s now found via Settings → Sync and Google services → Autocomplete searches and URLs … disabled turns it off. (Chromium has it too).
Brave (Nightly and Dev on my desktop) has the Autocomplete searches and URLs toggle within Settings → Privacy and security (see (a) screenshot)
HOWEVER, this setting on Brave does not have the same effect. (see (b) screenshot) … it still shows typed history in the omnibox.
(a)
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(b)
