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Add all of the missing filetype icons in nearby-preview. Rework the
existing elements so that the sizing/spacing/colors fit the spec. Add
additional ShareTypes for the new icons.

Bug: 1123942
Change-Id: I49b64014ec22e30386e4438650c3ed8fefe9a1d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2499069Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Curt Clemens <cclem@google.com>
Cr-Commit-Position: refs/heads/master@{#823649}