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This CL introduces WebSocket throttling on network::WebSocketFactory by
moving some logic from content/browser/websockets to services/network.

Bug: 721400
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ie007765411d95d1854fc0271652d599e5ccbcd0c
Reviewed-on: https://chromium-review.googlesource.com/979872
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545766}