Revert "Enable WebSockets over HTTP/2."

This reverts commit 75fe7e99df3ced79f526f8e20919a3f2959dbbab.

Reason for revert: Failing on MSan bot:

https://uberchromegw.corp.google.com/i/chromium.memory/builders/Linux%20MSan%20Tests/builds/8103

Original change's description:
> Enable WebSockets over HTTP/2.
> 
> Change HttpStreamFactoryImpl::Job to allow secure WebSocket requests to
> use an existing HTTP/2 connection if the server has already indicated
> support.  If no such connection exists, a new non-HTTP/2 connection is
> created for the WebSocket request just like before.
> 
> Bug: 801564
> Change-Id: I72541fcb8c88906699bf85ff305f2b2d590095ca
> Reviewed-on: https://chromium-review.googlesource.com/905344
> Commit-Queue: Bence Béky <bnc@chromium.org>
> Reviewed-by: Adam Rice <ricea@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#538584}

TBR=ricea@chromium.org,bnc@chromium.org

Change-Id: I8ef9343117a4a0099f8dc15261e2ed6bdb277088
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 801564
Reviewed-on: https://chromium-review.googlesource.com/933303
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538637}
3 files changed