Delete the ClientSocketPoolHistograms class.

net/socket/client_socket_pool_base.h

Index: net/socket/client_socket_pool_base.h
diff --git a/net/socket/client_socket_pool_base.h b/net/socket/client_socket_pool_base.h
index 76ae919f18954db71b2bfab0ce0ee2db50427e93..5270155081bc88cb5f1d670f32e8b8ce0803c03a 100644
--- a/net/socket/client_socket_pool_base.h
+++ b/net/socket/client_socket_pool_base.h
@@ -702,17 +702,17 @@ class ClientSocketPoolBase {
   // 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() {}
@@ -824,10 +824,6 @@ class ClientSocketPoolBase {
     return helper_.ConnectionTimeout();
   }
 
-  ClientSocketPoolHistograms* histograms() const {
-    return histograms_;
-  }
-
   void EnableConnectBackupJobs() { helper_.EnableConnectBackupJobs(); }
 
   bool CloseOneIdleSocket() { return helper_.CloseOneIdleSocket(); }
@@ -868,8 +864,6 @@ class ClientSocketPoolBase {
     const scoped_ptr<ConnectJobFactory> connect_job_factory_;
   };
 
-  // Histograms for the pool
-  ClientSocketPoolHistograms* const histograms_;
   internal::ClientSocketPoolBaseHelper helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSocketPoolBase);