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The fact that the LIVE_STATE_USING_WEB_SOCKETS reason exists might
confuse some devs who could assume that using a WebSocket will protect
their page, this add a comment to specify that this heuristic isn't
currently used.

Change-Id: Ibc6034a53c87291993dfa66094b69a2fa55aa0cf
Reviewed-on: https://chromium-review.googlesource.com/c/1319771Reviewed-by: François Doray <fdoray@chromium.org>
Commit-Queue: Sébastien Marchand <sebmarchand@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605750}