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This change plumbs a NetworkContext for WebSocket creation into the
|FidoDiscoveryFactory| when caBLEv2 is enabled.

BUG=1002262

Change-Id: I0fabe9642c785669c75516207bf4d8f2f8c147e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340389
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#799869}