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This flag is used to enable using the Multilogin endpoint on desktop
platforms.

Bug: None

Change-Id: If7add4d0adb85904fe61c782c65b480b7cc606dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362899Reviewed-by: David Roger <droger@chromium.org>
Commit-Queue: Mihai Sardarescu <msarda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799580}