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When Chrome is in first run state, opening a second window in
incognito, blocks the UI, and doesn't show an ntp.
Fixed by showing ntp on empty tab list (removed out-of-date comment)
Fixed by skipping first run ui on incognito.

Bug: 1113547
Change-Id: I5281acb44ea3575c157988e86b855a404488a9e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362964Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: David Jean <djean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800934}