net: clean up SSLHostInfo construction.

net/base/ssl_host_info.h

Index: net/base/ssl_host_info.h
diff --git a/net/base/ssl_host_info.h b/net/base/ssl_host_info.h
index 77c40fb8548b44db9524adba3474addd5b44cf1c..ae9ac6af2a9e71dbbe99ab5226c64ac7619e2576 100644
--- a/net/base/ssl_host_info.h
+++ b/net/base/ssl_host_info.h
@@ -15,9 +15,10 @@ namespace net {
 // 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.
@@ -45,10 +46,15 @@ class SSLHostInfo :
   // 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;
+};
+
+class SSLHostInfoFactory {
+ public:
+  virtual ~SSLHostInfoFactory();
 
- protected:
-  friend class base::RefCountedThreadSafe<SSLHostInfo>;
-  virtual ~SSLHostInfo() { }
+  // GetForHost returns a fresh, allocated SSLHostInfo for the given hostname
+  // or NULL on failure.
+  virtual SSLHostInfo* GetForHost(const std::string& hostname) = 0;
 };
 
 }  // namespace net