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This change causes polychrome builds to use TabDialogsViewsMac or
TabDialogsViews as appropriate, instead of TabDialogsViews in all cases. This
fixes a bunch of browser tests.

Bug: 817408
Change-Id: I1f3f43411856bfc70232e969ce3afaa484a52ee3
Reviewed-on: https://chromium-review.googlesource.com/960682
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543356}