Delete the ClientSocketPoolHistograms class.

net/socket/transport_client_socket_pool.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_SOCKET_TRANSPORT_CLIENT_SOCKET_POOL_H_
 #define NET_SOCKET_TRANSPORT_CLIENT_SOCKET_POOL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/profiler/scoped_tracker.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "net/base/host_port_pair.h"
 #include "net/dns/host_resolver.h"
 #include "net/dns/single_request_host_resolver.h"
 #include "net/socket/client_socket_pool.h"
 #include "net/socket/client_socket_pool_base.h"
-#include "net/socket/client_socket_pool_histograms.h"
 
 namespace net {
 
 class ClientSocketFactory;
 
 typedef base::Callback<int(const AddressList&, const BoundNetLog& net_log)>
 OnHostResolutionCallback;
 
 class NET_EXPORT_PRIVATE TransportSocketParams
     : public base::RefCounted<TransportSocketParams> {
@@ skipping 180 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(TransportConnectJob);
 };
 
 class NET_EXPORT_PRIVATE TransportClientSocketPool : public ClientSocketPool {
  public:
   typedef TransportSocketParams SocketParams;
 
   TransportClientSocketPool(
       int max_sockets,
       int max_sockets_per_group,
-      ClientSocketPoolHistograms* histograms,
       HostResolver* host_resolver,
       ClientSocketFactory* client_socket_factory,
       NetLog* net_log);
 
   ~TransportClientSocketPool() override;
 
   // ClientSocketPool implementation.
   int RequestSocket(const std::string& group_name,
                     const void* resolve_info,
                     RequestPriority priority,
@@ skipping 13 matching lines @@
   void CloseIdleSockets() override;
   int IdleSocketCount() const override;
   int IdleSocketCountInGroup(const std::string& group_name) const override;
   LoadState GetLoadState(const std::string& group_name,
                          const ClientSocketHandle* handle) const override;
   base::DictionaryValue* GetInfoAsValue(
       const std::string& name,
       const std::string& type,
       bool include_nested_pools) const override;
   base::TimeDelta ConnectionTimeout() const override;
-  ClientSocketPoolHistograms* histograms() const override;
 
   // HigherLayeredPool implementation.
   bool IsStalled() const override;
   void AddHigherLayeredPool(HigherLayeredPool* higher_pool) override;
   void RemoveHigherLayeredPool(HigherLayeredPool* higher_pool) override;
 
  protected:
   // Methods shared with WebSocketTransportClientSocketPool
   void NetLogTcpClientSocketPoolRequestedSocket(
       const BoundNetLog& net_log,
@@ skipping 98 matching lines @@
         break;
     }
   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 
   return rv;
 }
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TRANSPORT_CLIENT_SOCKET_POOL_H_