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Three incognito icon resources are updated to match the new material
design.

Bug: 997054
Change-Id: I4fd65a6e91992eea88a72f19dc4deeabf41b2b73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1794862Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Auto-Submit: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704078}