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In the SWA Data Source register all the resources from the file_manager
extension so we can use the same relative paths from the main.html used
in the extension.

With this change we can stop inlining the CSS via flattenhtml GRD
option.

Bug: 1113981
Change-Id: I3eb00b8ae3b0dc79273e1cdea00b5abc1426812a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580670
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835567}