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This change moves logfont_win.mojom from //mojo/common to
//mojo/public/mojom/base and logfont_win.typemap to
//mojo/public/cpp/base, as well as text_direction.mojom and
corresponding files. Unit test for TextDirection was updated and moved
to mojo_unittests.

Bug: 799482
Change-Id: Ib3d8b09d7aa3b7e12d3f66b38dbcea294a28c035
Reviewed-on: https://chromium-review.googlesource.com/971263Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544843}