Remove HTTP pipelining support.

net/http/http_pipelined_host.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_HOST_H_
-#define NET_HTTP_HTTP_PIPELINED_HOST_H_
-
-#include "net/base/host_port_pair.h"
-#include "net/base/net_export.h"
-#include "net/http/http_pipelined_connection.h"
-#include "net/http/http_pipelined_host_capability.h"
-
-namespace base {
-class Value;
-}
-
-namespace net {
-
-class BoundNetLog;
-class ClientSocketHandle;
-class HostPortPair;
-class HttpPipelinedStream;
-class ProxyInfo;
-struct SSLConfig;
-
-// Manages all of the pipelining state for specific host with active pipelined
-// HTTP requests. Manages connection jobs, constructs pipelined streams, and
-// assigns requests to the least loaded pipelined connection.
-class NET_EXPORT_PRIVATE HttpPipelinedHost {
- public:
-  class NET_EXPORT_PRIVATE Key {
-   public:
-    Key(const HostPortPair& origin);
-
-    // The host and port associated with this key.
-    const HostPortPair& origin() const { return origin_; }
-
-    bool operator<(const Key& rhs) const;
-
-   private:
-    const HostPortPair origin_;
-  };
-
-  class Delegate {
-   public:
-    // Called when a pipelined host has no outstanding requests on any of its
-    // pipelined connections.
-    virtual void OnHostIdle(HttpPipelinedHost* host) = 0;
-
-    // Called when a pipelined host has newly available pipeline capacity, like
-    // when a request completes.
-    virtual void OnHostHasAdditionalCapacity(HttpPipelinedHost* host) = 0;
-
-    // Called when a host determines if pipelining can be used.
-    virtual void OnHostDeterminedCapability(
-        HttpPipelinedHost* host,
-        HttpPipelinedHostCapability capability) = 0;
-  };
-
-  class Factory {
-   public:
-    virtual ~Factory() {}
-
-    // Returns a new HttpPipelinedHost.
-    virtual HttpPipelinedHost* CreateNewHost(
-        Delegate* delegate, const Key& key,
-        HttpPipelinedConnection::Factory* factory,
-        HttpPipelinedHostCapability capability,
-        bool force_pipelining) = 0;
-  };
-
-  virtual ~HttpPipelinedHost() {}
-
-  // Constructs a new pipeline on |connection| and returns a new
-  // HttpPipelinedStream that uses it.
-  virtual HttpPipelinedStream* CreateStreamOnNewPipeline(
-      ClientSocketHandle* connection,
-      const SSLConfig& used_ssl_config,
-      const ProxyInfo& used_proxy_info,
-      const BoundNetLog& net_log,
-      bool was_npn_negotiated,
-      NextProto protocol_negotiated) = 0;
-
-  // Tries to find an existing pipeline with capacity for a new request. If
-  // successful, returns a new stream on that pipeline. Otherwise, returns NULL.
-  virtual HttpPipelinedStream* CreateStreamOnExistingPipeline() = 0;
-
-  // Returns true if we have a pipelined connection that can accept new
-  // requests.
-  virtual bool IsExistingPipelineAvailable() const = 0;
-
-  // Returns a Key that uniquely identifies this host.
-  virtual const Key& GetKey() const = 0;
-
-  // Creates a Value summary of this host's pipelines. Caller assumes
-  // ownership of the returned Value.
-  virtual base::Value* PipelineInfoToValue() const = 0;
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_HTTP_PIPELINED_HOST_H_