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This CL makes it so that WebSocketTransportClientSocketPool no longer
inherits from TransportClientSocketPool. Since it has almost no shared
logic, this inheritence was unnecessary and a little confusing.

Bug: 944097
Change-Id: I5c70257e3b48bf05bf5e7e9c5732cedb24166904
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532919
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644634}