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In order to reuse COEP in other objects, we move its definition into
an easy to include single struct mojo file. It replaces the massive
network_context.mojom include.

Change-Id: I245d68d3fe1880b369c3c65801c502a1aee8b027
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930738Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Pâris Meuleman <pmeuleman@chromium.org>
Commit-Queue: Arthur Hemery <ahemery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718655}