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This CL adds new color ids and colors for the avatar header assets for
incognito and guest modes using the old method by setting them manually
and the new method by extracting the colors from existing core colors.

Aligning colors in incognito and guest for both the header asset and
the avatar icon.

Screenshots:
https://screenshot.googleplex.com/BNC82JK2UkZR5eb.png

Bug: 1105763
Change-Id: Idcc27c87b081f22429c7342c042d39e721d6ef86
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418654
Commit-Queue: Mariam Ali <alimariam@google.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814749}