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Change Files app to NOT inline CSS and its images.

Measurements showed that this has not significant impact to the startup
time.

The flattenhtml option used to inline the CSS file is considered
deprecated for the latest build tools used in Web UIs.

Bug: 1151829
Change-Id: Ibf0bf4f4a77a40ac5a48b1b999a4fde65d7c6bdb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560281
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835000}