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This reverts commit b921591d.

Reason for revert:
Probable cause of WebView segfault in https://crbug.com/822732

Original change's description:
> Move websocket.mojom from third_party/WebKit to services/network
> 
> As a preparation to integrate websocket with the network service, this
> CL moves the mojom file to /services/network.
> 
> Bug: 721400
> Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
> Change-Id: I1284cbd9dd3292c41d1acba34835c6c6d44d48a3
> Reviewed-on: https://chromium-review.googlesource.com/961173
> Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#543632}

TBR=kinuko@chromium.org,jam@chromium.org,yhirano@chromium.org

Change-Id: I6062a78052b82364418c9f57ab768c8f001cb549
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 721400,822732
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Reviewed-on: https://chromium-review.googlesource.com/966761Reviewed-by: Anita Woodruff <awdf@chromium.org>
Commit-Queue: Anita Woodruff <awdf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543720}