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In order to deal with mojo message ordering uncertainty between
WebSocketHandshakeClient and WebSocketClient, this CL has
WebSocketHandleImpl::binding_as_client_ binds when
OnConnectionEstablished is called.

mojom.WebSocketClient.OnFailChannel is replaced with
InterfacePtr::ResetWithReason because |client_| may not be available
when network::WebSocket::WebSocketEventHandler::OnFailChannel is called.

Bug: 989406, 967524
Change-Id: Ic14357133a85317a07271a3615a21ff3e61fe37d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1728917Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Adam Rice <ricea@chromium.org>
Reviewed-by: Yoichi Osato <yoichio@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#683477}