Delete the ClientSocketPoolHistograms class.

net/socket/client_socket_pool_base.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.
 //
 // A ClientSocketPoolBase is used to restrict the number of sockets open at
 // a time.  It also maintains a list of idle persistent sockets for reuse.
 // Subclasses of ClientSocketPool should compose ClientSocketPoolBase to handle
 // the core logic of (1) restricting the number of active (connected or
 // connecting) sockets per "group" (generally speaking, the hostname), (2)
 // maintaining a per-group list of idle, persistent sockets for reuse, and (3)
@@ skipping 684 matching lines @@
    private:
     DISALLOW_COPY_AND_ASSIGN(ConnectJobFactory);
   };
 
   // |max_sockets| is the maximum number of sockets to be maintained by this
   // ClientSocketPool.  |max_sockets_per_group| specifies the maximum number of
   // sockets a "group" can have.  |unused_idle_socket_timeout| specifies how
   // long to leave an unused idle socket open before closing it.
   // |used_idle_socket_timeout| specifies how long to leave a previously used
   // idle socket open before closing it.
-  ClientSocketPoolBase(
-      HigherLayeredPool* self,
-      int max_sockets,
-      int max_sockets_per_group,
-      ClientSocketPoolHistograms* histograms,
-      base::TimeDelta unused_idle_socket_timeout,
-      base::TimeDelta used_idle_socket_timeout,
-      ConnectJobFactory* connect_job_factory)
-      : histograms_(histograms),
-        helper_(self, max_sockets, max_sockets_per_group,
-                unused_idle_socket_timeout, used_idle_socket_timeout,
+  ClientSocketPoolBase(HigherLayeredPool* self,
+                       int max_sockets,
+                       int max_sockets_per_group,
+                       base::TimeDelta unused_idle_socket_timeout,
+                       base::TimeDelta used_idle_socket_timeout,
+                       ConnectJobFactory* connect_job_factory)
+      : helper_(self,
+                max_sockets,
+                max_sockets_per_group,
+                unused_idle_socket_timeout,
+                used_idle_socket_timeout,
                 new ConnectJobFactoryAdaptor(connect_job_factory)) {}
 
   virtual ~ClientSocketPoolBase() {}
 
   // These member functions simply forward to ClientSocketPoolBaseHelper.
   void AddLowerLayeredPool(LowerLayeredPool* lower_pool) {
     helper_.AddLowerLayeredPool(lower_pool);
   }
 
   void AddHigherLayeredPool(HigherLayeredPool* higher_pool) {
@@ skipping 91 matching lines @@
 
   base::DictionaryValue* GetInfoAsValue(const std::string& name,
                                         const std::string& type) const {
     return helper_.GetInfoAsValue(name, type);
   }
 
   base::TimeDelta ConnectionTimeout() const {
     return helper_.ConnectionTimeout();
   }
 
-  ClientSocketPoolHistograms* histograms() const {
-    return histograms_;
-  }
-
   void EnableConnectBackupJobs() { helper_.EnableConnectBackupJobs(); }
 
   bool CloseOneIdleSocket() { return helper_.CloseOneIdleSocket(); }
 
   bool CloseOneIdleConnectionInHigherLayeredPool() {
     return helper_.CloseOneIdleConnectionInHigherLayeredPool();
   }
 
  private:
   // This adaptor class exists to bridge the
@@ skipping 20 matching lines @@
           group_name, casted_request, delegate);
     }
 
     base::TimeDelta ConnectionTimeout() const override {
       return connect_job_factory_->ConnectionTimeout();
     }
 
     const scoped_ptr<ConnectJobFactory> connect_job_factory_;
   };
 
-  // Histograms for the pool
-  ClientSocketPoolHistograms* const histograms_;
   internal::ClientSocketPoolBaseHelper helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBase);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_CLIENT_SOCKET_POOL_BASE_H_