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Deleting a file or folder exercise different code paths in Files app.
There is a test case for a folder (aka, a directory). Add a test case
for deleting a file.

Test: browser_tests --gtest_filter="*FilesApp*keyboardDelete*"
Bug: 873915
Change-Id: I618f7808be3eab4f73a97068cd8298f05f464ed8
Reviewed-on: https://chromium-review.googlesource.com/1174588Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583172}