net: clean up SSLHostInfo construction.

net/base/ssl_host_info.h

 // Copyright (c) 2010 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_SSL_HOST_INFO_H
 #define NET_BASE_SSL_HOST_INFO_H
 
 #include <string>
 #include "base/ref_counted.h"
 #include "net/base/completion_callback.h"
 
 namespace net {
 
 // SSLHostInfo is an interface for fetching information about an SSL server.
 // This information may be stored on disk so does not include keys or session
 // information etc. Primarily it's intended for caching the server's
 // certificates.
-class SSLHostInfo :
-    public base::RefCountedThreadSafe<SSLHostInfo> {
+class SSLHostInfo {
  public:
+  virtual ~SSLHostInfo();
+
   // Start will commence the lookup. This must be called before any other
   // methods. By opportunistically calling this early, it may be possible to
   // overlap this object's lookup and reduce latency.
   virtual void Start() = 0;
 
   // WaitForDataReady returns OK if the fetch of the requested data has
   // completed. Otherwise it returns ERR_IO_PENDING and will call |callback| on
   // the current thread when ready.
   //
   // Only a single callback can be outstanding at a given time and, in the
   // event that WaitForDataReady returns OK, it's the caller's responsibility
   // to delete |callback|.
   //
   // |callback| may be NULL, in which case ERR_IO_PENDING may still be returned
   // but, obviously, a callback will never be made.
   virtual int WaitForDataReady(CompletionCallback* callback) = 0;
 
   // data returns any host information once WaitForDataReady has indicated that
   // the fetch has completed. In the event of an error, |data| returns an empty
   // string.
   virtual const std::string& data() const = 0;
 
   // Set allows for the host information to be updated for future users. This
   // is a fire and forget operation: the caller may drop its reference from
   // this object and the store operation will still complete. This can only be
   // called once WaitForDataReady has returned OK or called its callback.
   virtual void Set(const std::string& new_data) = 0;
+};
 
- protected:
-  friend class base::RefCountedThreadSafe<SSLHostInfo>;
-  virtual ~SSLHostInfo() { }
+class SSLHostInfoFactory {
+ public:
+  virtual ~SSLHostInfoFactory();
+
+  // GetForHost returns a fresh, allocated SSLHostInfo for the given hostname
+  // or NULL on failure.
+  virtual SSLHostInfo* GetForHost(const std::string& hostname) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_SSL_HOST_INFO_H