Delete the ClientSocketPoolHistograms class.

net/socket/ssl_client_socket_pool.cc

Index: net/socket/ssl_client_socket_pool.cc
diff --git a/net/socket/ssl_client_socket_pool.cc b/net/socket/ssl_client_socket_pool.cc
index 342e5ea8825d66b4968eb112cd4381191e51a815..0b0df9a6f9ad993f838fb0c8e705fbeb924b4059 100644
--- a/net/socket/ssl_client_socket_pool.cc
+++ b/net/socket/ssl_client_socket_pool.cc
@@ -505,7 +505,6 @@ SSLClientSocketPool::SSLConnectJobFactory::~SSLConnectJobFactory() {
 SSLClientSocketPool::SSLClientSocketPool(
     int max_sockets,
     int max_sockets_per_group,
-    ClientSocketPoolHistograms* histograms,
     CertVerifier* cert_verifier,
     ChannelIDService* channel_id_service,
     TransportSecurityState* transport_security_state,
@@ -524,7 +523,6 @@ SSLClientSocketPool::SSLClientSocketPool(
       base_(this,
             max_sockets,
             max_sockets_per_group,
-            histograms,
             ClientSocketPool::unused_idle_socket_timeout(),
             ClientSocketPool::used_idle_socket_timeout(),
             new SSLConnectJobFactory(
@@ -665,10 +663,6 @@ base::TimeDelta SSLClientSocketPool::ConnectionTimeout() const {
   return base_.ConnectionTimeout();
 }
 
-ClientSocketPoolHistograms* SSLClientSocketPool::histograms() const {
-  return base_.histograms();
-}
-
 bool SSLClientSocketPool::IsStalled() const {
   return base_.IsStalled();
 }