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Since TrashEntry is now in common, we can remove other declarations of
TrashEntry.  Externs can use FilesAppEntry, all others can use
TrashEntry directly.

Bug: 953310
Change-Id: I4a8f6904152daecf917975caa3abff14b92e189a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573396Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833506}