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The example mojo code is being moved the SWA sample app. Remove it from
SWA files app, leaving an empty shell that will be filled-in later.

Bug: 1113981
Change-Id: If329ce6ba9df1bc08394892d67d6023f91cbeb21
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536581Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827687}