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This change moves the file, file path and file_info mojom files from
//mojo/common to //mojo/public/mojom/base. Corresponding typemap
and struct traits file were also moved. Unit tests for file
and file_path were updated to use SerializeAndDeserialize() from
//mojo/public/cpp/test_support/test_utils.h and moved to mojo_unittests.

Bug: 799482
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I18cfd1848b3411ae1524280ed72ae4508b00208e
Reviewed-on: https://chromium-review.googlesource.com/959423
Commit-Queue: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542908}