Revert of Add blink::WebSocketHandshakeThrottle

third_party/WebKit/public/platform/WebSocketHandshakeThrottle.h

-// Copyright 2017 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-//
-// WebSocketHandshakeThrottle provides a facility for embedders to delay
-// WebSocket connection establishment. Specifically, at the same time as the
-// handshake is started blink::Platform::CreateWebSocketHandshakeThrottle() will
-// be called. If a non-null WebSocketHandshakeThrottle is returned then
-// ThrottleHandshake() will be called on it. If the result is error then the
-// handshake will be aborted, and a connection error will be reported to
-// Javascript. If the throttle hasn't reported a result when the WebSocket
-// handshake succeeds then Blink will wait for the throttle result before
-// reporting the connection is open to Javascript.
-
-#ifndef WebSocketHandshakeThrottle_h
-#define WebSocketHandshakeThrottle_h
-
-#include "public/platform/WebCallbacks.h"
-
-namespace blink {
-
-class WebURL;
-class WebLocalFrame;
-class WebString;
-
-// Embedders can implement this class to delay WebSocket connections.
-class WebSocketHandshakeThrottle {
- public:
-  // Destruction implies that the handshake has been aborted. Any ongoing work
-  // should be cleaned up if possible.
-  virtual ~WebSocketHandshakeThrottle() {}
-
-  // The WebCallbacks OnSuccess or OnError should be called asychronously to
-  // permit Javascript to use the connection or not. OnError should be passed
-  // a message to be displayed on the console indicating why the handshake was
-  // blocked. This object will be destroyed synchronously inside the
-  // callbacks. Callbacks must not be called after this object has been
-  // destroyed.
-  virtual void ThrottleHandshake(const WebURL&,
-                                 WebLocalFrame*,
-                                 WebCallbacks<void, const WebString&>*) = 0;
-};
-
-}  // namespace blink
-
-#endif  // WebSocketHandshakeThrottle_h