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This also switches to using these tints to calculate the frame (and incognito
toolbar button) colors, so the two cannot get out of sync in the future.

Bug: 865130
Change-Id: I386be5409589b9a7b45abadef567b1e41f593c39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1759292
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688233}