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If file is local but unshared display message:
IDS_FILE_BROWSER_UNABLE_TO_OPEN_WITH_PLUGIN_VM_DIRECTORY_NOT_SHARED_MESSAGE.

If file is on an external drive (usb/Google Drive) display message:
IDS_FILE_BROWSER_UNABLE_TO_OPEN_WITH_PLUGIN_VM_EXTERNAL_DRIVE_MESSAGE

TBR=timloh@chromium.org

Bug: 1049453
Change-Id: I98a35e51b98d11537c0a675b0a1a28645b60ccfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2217512
Commit-Queue: Julian Watson <juwa@google.com>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773903}