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This to a great extent prevents the knob animation on every opening of
an incognito ntp.

Bug: 967668
Change-Id: Ib99ba020b419d8c9aed2c910049d2662a3850d4d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855962
Commit-Queue: Huanzhong Huang <huanzhong@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706340}