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Change type of HttpNetworkSession::websocket_endpoint_lock_manager_ from
unique_ptr<WebSocketEndpointLockManager> to
WebSocketEndpointLockManager.  This member object is constructed upon
HttpNetworkSession construction and is never explicitly destroyed (only
implicitly when the unique_ptr goes out of scope upon HttpNetworkSession
destruction).  The same lifetime can be achieved with a
WebSocketEndpointLockManager member.

It is possible though not particularily likely that this will solve
https://crbug.com/908734, but since the cause of that crash is not
known, it is worth trying.  This CL is an improvement regardless.

Bug: 908734
Change-Id: Iddd2117dc5256e06672ae2964ad7cfebefe76fe0
Reviewed-on: https://chromium-review.googlesource.com/c/1356862Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Bence Béky <bnc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613110}