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On Mac, Secondary UI can be typeset differently to Browser UI,
since one is drawn by Views and the other by Cocoa. This can
influence things like text width in subtle ways. On Mac,
gfx::Elide methods need to be aware of how the text will eventually
be typeset.

This CL adds enum class gfx::Typesetter, which can be fed through
to gfx:: methods used for eliding text or determining its width.

For the first step, update callers of gfx::ElideFilename to use the
correct typesetter.

Bug: 798927, 697407
Change-Id: I7eea58391475a68fefc469e7b87729664087777d
Reviewed-on: https://chromium-review.googlesource.com/848695Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528199}