Reverting again ... More crashes, and the instrumentation did not appear to help

net/socket/socks_client_socket_pool.h

Index: net/socket/socks_client_socket_pool.h
===================================================================
--- net/socket/socks_client_socket_pool.h	(revision 131144)
+++ net/socket/socks_client_socket_pool.h	(working copy)
@@ -105,8 +105,7 @@
   DISALLOW_COPY_AND_ASSIGN(SOCKSConnectJob);
 };
 
-class NET_EXPORT_PRIVATE SOCKSClientSocketPool
-    : public ClientSocketPool, public LayeredPool {
+class NET_EXPORT_PRIVATE SOCKSClientSocketPool : public ClientSocketPool {
  public:
   SOCKSClientSocketPool(
       int max_sockets,
@@ -140,8 +139,6 @@
 
   virtual void Flush() OVERRIDE;
 
-  virtual bool IsStalled() const OVERRIDE;
-
   virtual void CloseIdleSockets() OVERRIDE;
 
   virtual int IdleSocketCount() const OVERRIDE;
@@ -153,10 +150,6 @@
       const std::string& group_name,
       const ClientSocketHandle* handle) const OVERRIDE;
 
-  virtual void AddLayeredPool(LayeredPool* layered_pool) OVERRIDE;
-
-  virtual void RemoveLayeredPool(LayeredPool* layered_pool) OVERRIDE;
-
   virtual base::DictionaryValue* GetInfoAsValue(
       const std::string& name,
       const std::string& type,
@@ -166,9 +159,6 @@
 
   virtual ClientSocketPoolHistograms* histograms() const OVERRIDE;
 
-  // LayeredPool implementation.
-  virtual bool CloseOneIdleConnection() OVERRIDE;
-
  private:
   typedef ClientSocketPoolBase<SOCKSSocketParams> PoolBase;