Remove HTTP pipelining support.

net/http/http_pipelined_connection.h

-// Copyright (c) 2012 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.
-
-#ifndef NET_HTTP_HTTP_PIPELINED_CONNECTION_H_
-#define NET_HTTP_HTTP_PIPELINED_CONNECTION_H_
-
-#include "net/base/net_export.h"
-#include "net/base/net_log.h"
-#include "net/socket/ssl_client_socket.h"
-
-namespace net {
-
-class BoundNetLog;
-class ClientSocketHandle;
-class HostPortPair;
-class HttpPipelinedStream;
-class ProxyInfo;
-struct SSLConfig;
-
-class NET_EXPORT_PRIVATE HttpPipelinedConnection {
- public:
-  enum Feedback {
-    OK,
-    PIPELINE_SOCKET_ERROR,
-    OLD_HTTP_VERSION,
-    MUST_CLOSE_CONNECTION,
-    AUTHENTICATION_REQUIRED,
-  };
-
-  class Delegate {
-   public:
-    // Called when a pipeline has newly available capacity. This may be because
-    // the first request has been sent and the pipeline is now active. Or, it
-    // may be because a request successfully completed.
-    virtual void OnPipelineHasCapacity(HttpPipelinedConnection* pipeline) = 0;
-
-    // Called every time a pipeline receives headers. Lets the delegate know if
-    // the headers indicate that pipelining can be used.
-    virtual void OnPipelineFeedback(HttpPipelinedConnection* pipeline,
-                                    Feedback feedback) = 0;
-  };
-
-  class Factory {
-   public:
-    virtual ~Factory() {}
-
-    virtual HttpPipelinedConnection* CreateNewPipeline(
-        ClientSocketHandle* connection,
-        Delegate* delegate,
-        const HostPortPair& origin,
-        const SSLConfig& used_ssl_config,
-        const ProxyInfo& used_proxy_info,
-        const BoundNetLog& net_log,
-        bool was_npn_negotiated,
-        NextProto protocol_negotiated) = 0;
-  };
-
-  virtual ~HttpPipelinedConnection() {}
-
-  // Returns a new stream that uses this pipeline.
-  virtual HttpPipelinedStream* CreateNewStream() = 0;
-
-  // The number of streams currently associated with this pipeline.
-  virtual int depth() const = 0;
-
-  // True if this pipeline can accept new HTTP requests. False if a fatal error
-  // has occurred.
-  virtual bool usable() const = 0;
-
-  // True if this pipeline has bound one request and is ready for additional
-  // requests.
-  virtual bool active() const = 0;
-
-  // The SSLConfig used to establish this connection.
-  virtual const SSLConfig& used_ssl_config() const = 0;
-
-  // The ProxyInfo used to establish this connection.
-  virtual const ProxyInfo& used_proxy_info() const = 0;
-
-  // The BoundNetLog of this pipelined connection.
-  virtual const BoundNetLog& net_log() const = 0;
-
-  // True if this connection was NPN negotiated.
-  virtual bool was_npn_negotiated() const = 0;
-
-  // Protocol negotiated with the server.
-  virtual NextProto protocol_negotiated() const = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_HTTP_PIPELINED_CONNECTION_H_