base::RefCounted now DCHECKs when referenced from multiple threads.

content/browser/renderer_host/pepper/ssl_context_helper.h

 // Copyright 2013 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 CONTENT_BROWSER_RENDERER_HOST_PEPPER_SSL_CONTEXT_HELPER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_PEPPER_SSL_CONTEXT_HELPER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/ssl/ssl_config_service.h"
 
 namespace net {
 class CertVerifier;
 class TransportSecurityState;
 }
 
 namespace content {
 
-class SSLContextHelper : public base::RefCounted<SSLContextHelper> {
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
+class SSLContextHelper : public base::UnsafeRefCounted<SSLContextHelper> {
  public:
   SSLContextHelper();
 
   net::CertVerifier* GetCertVerifier();
   net::TransportSecurityState* GetTransportSecurityState();
   const net::SSLConfig& ssl_config() { return ssl_config_; }
 
  private:
-  friend class base::RefCounted<SSLContextHelper>;
+  friend class base::UnsafeRefCounted<SSLContextHelper>;
 
   ~SSLContextHelper();
 
   // This is lazily created. Users should use GetCertVerifier to retrieve it.
   scoped_ptr<net::CertVerifier> cert_verifier_;
   // This is lazily created. Users should use GetTransportSecurityState to
   // retrieve it.
   scoped_ptr<net::TransportSecurityState> transport_security_state_;
 
   // The default SSL configuration settings are used, as opposed to Chrome's SSL
   // settings.
   net::SSLConfig ssl_config_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLContextHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_SSL_CONTEXT_HELPER_H_