Reland "Bump web_socket_channel to b612fc2caa9f4c3c8947b4ffbb274bce33c54a04"

This is a reland of commit 4d6919aa5e847b1a738d9b7b4d80885cc2a2ae09

Original change's description:
> Bump web_socket_channel to b612fc2caa9f4c3c8947b4ffbb274bce33c54a04
>
> Changes:
> ```
> > git log --format="%C(auto) %h %s" ced3a37..b612fc2
>  https://dart.googlesource.com/web_socket_channel.git/+/b612fc2 Avoid importing io_web_socket namespace (343)
>  https://dart.googlesource.com/web_socket_channel.git/+/ce69d31 Rename WebSocketAdapterWebSocketChannel to AdapterWebSocketChannel (344)
>  https://dart.googlesource.com/web_socket_channel.git/+/429e7d9 Implement IOWebSocketChannel as a WebSocketAdapterWebSocket subclass (342)
>  https://dart.googlesource.com/web_socket_channel.git/+/00cb13a Remove WebSocketChannel constructor (341)
>  https://dart.googlesource.com/web_socket_channel.git/+/1f3dfd7 Create an adapter for `package:web_socket` (339)
>
> ```
>
> Diff: https://dart.googlesource.com/web_socket_channel.git/+/ced3a37193f89d5ee95792f342eeb15d3d55d8c1..b612fc2caa9f4c3c8947b4ffbb274bce33c54a04/
> Change-Id: I558a25a5f8cbe0704e40b7e60886c8934f04d2e8
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/362662
> Reviewed-by: Nate Bosch <nbosch@google.com>

Change-Id: Ic1cf4b8eb39e49813aaf3797150e25e924cc5b94
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/363780
Commit-Queue: Brian Quinlan <bquinlan@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
diff --git a/DEPS b/DEPS
index 939a2ad..205daa9 100644
--- a/DEPS
+++ b/DEPS
@@ -192,7 +192,7 @@
   "vector_math_rev": "43f2a77bb0be812b027a68a11792d563713b42a1",
   "watcher_rev": "1bd2f20d0d924c8422aa2b9afdb165bff4f053c0",
   "web_rev": "9d8c802d13b785b1a5b201c4a43605d640841c98",
-  "web_socket_channel_rev": "ced3a37193f89d5ee95792f342eeb15d3d55d8c1",
+  "web_socket_channel_rev": "b612fc2caa9f4c3c8947b4ffbb274bce33c54a04",
   "webdev_rev": "3a10b76f3937fb9b50e7971fb15f82b65dfe05ef",
   "webdriver_rev": "c80e01e6ce121e55c31e33a31e5d3950023e6bc9",
   "webkit_inspection_protocol_rev": "153fea4fe5ac45bebf0c2e76bb3d76b0f1fcdaae",