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Change FileSelection to receive VolumeManager to be able to get
location info and determine if the selection contains any read-only
entry.

Change logic to hide delete button to check read-only from the file
selection and the special case for /Downloads folder inside MyFiles.

Remove test checkDownloadsContextMenu with MyFilesVolume flag disabled
because the delete button behaves differently and the flag is enabled
by default.

Bug: 921483
Change-Id: I731624948606f6b7ccb6617dd424617d97b0020e
Reviewed-on: https://chromium-review.googlesource.com/c/1457884
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630096}