Remove HTTP pipelining support.

net/http/http_pipelined_host_impl.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_IMPL_H_
-#define NET_HTTP_HTTP_PIPELINED_HOST_IMPL_H_
-
-#include <map>
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.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.h"
-#include "net/http/http_pipelined_host_capability.h"
-
-namespace base {
-class Value;
-}
-
-namespace net {
-
-class BoundNetLog;
-class ClientSocketHandle;
-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 HttpPipelinedHostImpl
-    : public HttpPipelinedHost,
-      public HttpPipelinedConnection::Delegate {
- public:
-  HttpPipelinedHostImpl(HttpPipelinedHost::Delegate* delegate,
-                        const HttpPipelinedHost::Key& key,
-                        HttpPipelinedConnection::Factory* factory,
-                        HttpPipelinedHostCapability capability);
-  virtual ~HttpPipelinedHostImpl();
-
-  // HttpPipelinedHost interface
-  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) OVERRIDE;
-
-  virtual HttpPipelinedStream* CreateStreamOnExistingPipeline() OVERRIDE;
-
-  virtual bool IsExistingPipelineAvailable() const OVERRIDE;
-
-  // HttpPipelinedConnection::Delegate interface
-
-  // Called when a pipelined connection completes a request. Adds a pending
-  // request to the pipeline if the pipeline is still usable.
-  virtual void OnPipelineHasCapacity(
-      HttpPipelinedConnection* pipeline) OVERRIDE;
-
-  virtual void OnPipelineFeedback(
-      HttpPipelinedConnection* pipeline,
-      HttpPipelinedConnection::Feedback feedback) OVERRIDE;
-
-  virtual const Key& GetKey() const OVERRIDE;
-
-  // Creates a Value summary of this host's |pipelines_|. Caller assumes
-  // ownership of the returned Value.
-  virtual base::Value* PipelineInfoToValue() const OVERRIDE;
-
-  // Returns the maximum number of in-flight pipelined requests we'll allow on a
-  // single connection.
-  static int max_pipeline_depth() { return 3; }
-
- private:
-  struct PipelineInfo {
-    PipelineInfo();
-
-    int num_successes;
-  };
-  typedef std::map<HttpPipelinedConnection*, PipelineInfo> PipelineInfoMap;
-
-  // Called when a pipeline is empty and there are no pending requests. Closes
-  // the connection.
-  void OnPipelineEmpty(HttpPipelinedConnection* pipeline);
-
-  // Adds the next pending request to the pipeline if it's still usuable.
-  void AddRequestToPipeline(HttpPipelinedConnection* pipeline);
-
-  // Returns the current pipeline capacity based on |capability_|. This should
-  // not be called if |capability_| is INCAPABLE.
-  int GetPipelineCapacity() const;
-
-  // Returns true if |pipeline| can handle a new request. This is true if the
-  // |pipeline| is active, usable, has capacity, and |capability_| is
-  // sufficient.
-  bool CanPipelineAcceptRequests(HttpPipelinedConnection* pipeline) const;
-
-  // Called when |this| moves from UNKNOWN |capability_| to PROBABLY_CAPABLE.
-  // Causes all pipelines to increase capacity to start pipelining.
-  void NotifyAllPipelinesHaveCapacity();
-
-  HttpPipelinedHost::Delegate* delegate_;
-  const Key key_;
-  PipelineInfoMap pipelines_;
-  scoped_ptr<HttpPipelinedConnection::Factory> factory_;
-  HttpPipelinedHostCapability capability_;
-
-  DISALLOW_COPY_AND_ASSIGN(HttpPipelinedHostImpl);
-};
-
-}  // namespace net
-
-#endif  // NET_HTTP_HTTP_PIPELINED_HOST_IMPL_H_