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We switched to use chrome://favicon2 from base64 stream for favicon.
But for OTR profile chrome://favicon2 is not available. This CL fixes
favicon not showing up correctly in guest mode.

Related CL: https://chromium-review.googlesource.com/c/chromium/src/+/2406932

Bug: 1099917
Change-Id: I5fdd1dda997d08024d6ce3aa6d6a569d38ac026e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424510
Commit-Queue: Yuheng Huang <yuhengh@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Thomas Lukaszewicz <tluk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810287}