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Also adds a builder for TabIconView and converts to using it.

Bug: 1159562,1159563
Change-Id: Ib4f10159a609b676571ea9cb9f8250a82e3f6a38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613010
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840816}