Second patch in making destructors of refcounted objects private.

net/base/host_resolver_proc.h

 // Copyright (c) 2009 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_BASE_HOST_RESOLVER_PROC_H_
 #define NET_BASE_HOST_RESOLVER_PROC_H_
 
 #include <string>
 
 #include "base/ref_counted.h"
 #include "net/base/address_family.h"
 
 namespace net {
 
 class AddressList;
 
 // Interface for a getaddrinfo()-like procedure. This is used by unit-tests
 // to control the underlying resolutions in HostResolverImpl. HostResolverProcs
 // can be chained together; they fallback to the next procedure in the chain
 // by calling ResolveUsingPrevious().
 //
 // Note that implementations of HostResolverProc *MUST BE THREADSAFE*, since
 // the HostResolver implementation using them can be multi-threaded.
 class HostResolverProc : public base::RefCountedThreadSafe<HostResolverProc> {
  public:
   explicit HostResolverProc(HostResolverProc* previous);
-  virtual ~HostResolverProc() {}
 
   // Resolves |host| to an address list, restricting the results to addresses
   // in |address_family|. If successful returns OK and fills |addrlist| with
   // a list of socket addresses. Otherwise returns a network error code.
   virtual int Resolve(const std::string& host,
                       AddressFamily address_family,
                       AddressList* addrlist) = 0;
 
  protected:
+  friend class base::RefCountedThreadSafe<HostResolverProc>;
+
+  virtual ~HostResolverProc() {}
+
   // Asks the fallback procedure (if set) to do the resolve.
   int ResolveUsingPrevious(const std::string& host,
                            AddressFamily address_family,
                            AddressList* addrlist);
 
  private:
   friend class HostResolverImpl;
   friend class MockHostResolverBase;
   friend class ScopedDefaultHostResolverProc;
 
@@ skipping 20 matching lines @@
 // (i.e. this calls out to getaddrinfo()). If successful returns OK and fills
 // |addrlist| with a list of socket addresses. Otherwise returns a
 // network error code.
 int SystemHostResolverProc(const std::string& host,
                            AddressFamily address_family,
                            AddressList* addrlist);
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_PROC_H_