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With CL:2536584 the SWA files app main.html is auto-generated from the
files app main.html and provides its own CSS files. Thus, SWA main.css
file is no longer used: remove it.

Bug: 1113981
Change-Id: I88a7d0a02c10993f7c3113425466827f046939dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2540146
Auto-Submit: Noel Gordon <noel@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827938}