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Previously drive paths are used to obtain 'externalfile:' URL and the URL is
converted back to the drive path.

The CL uses FileSystemURL instead of drive paths so that the app can generate
external file URLs for other than drive files, and enables external file URLs
for MTP and FSP volumes.

BUG=367027
TEST=manually

Review URL: https://codereview.chromium.org/589473002

Cr-Commit-Position: refs/heads/master@{#296901}