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In the past we wanted to separate IPC stuff from other parts and that's
why WebSocketHandle[Impl] was created, but with mojo we don't need the
separation.

Bug: 977912
Change-Id: I35dd04c17ef4df8e0122ac0490696c255b5c1192
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1773010
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692150}