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Per the linked bug, RenderTextMac is effectively dead.  While I was touching
render_text_unittest.cc anyway, I thought I'd help a little with the cleanup.

Bug: 131618
Change-Id: I679ce91e4eebc9984ff44b0a8e899f0c36910ee7
Reviewed-on: https://chromium-review.googlesource.com/c/1343106
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609946}