GitLab

1. Allows to enable on device head suggest in incognito w/o enabling it
in non incognito first.
2. Removes request delay in incognito since there is no server
suggestion which we need to cope with.

Bug: 925072
Change-Id: I344ecc2c620cb95c3b5f7c929cac0d9287b3c05b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881978Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Commit-Queue: Ce Chen <cch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710127}