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Currently, if the sum of attachment sizes exceeds 25MB, WebRTC will be
disabled regardless of the user's data-usage setting. Because we already
provide the user an option to only use unmetered connections, we make
changes in this CL to respect the user's setting regardless of
attachment size.

We also add additional logging of supported mediums.

Manually tested that the correct mediums are sent to Nearby Connections;
however, there is an outstanding bug in Nearby Connections (b/176432167)
that supported medium choices are not respected.

Fixed: 1164688
Change-Id: I749ab72aaf48feac7e799561f1ad1bbb961f5e31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2619319
Auto-Submit: Josh Nohle <nohle@chromium.org>
Commit-Queue: James Vecore <vecore@google.com>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#842092}