RefCounted types should not have public destructors, chrome/ remaining parts

chrome/common/net/gaia/gaia_oauth_client.cc

Index: chrome/common/net/gaia/gaia_oauth_client.cc
diff --git a/chrome/common/net/gaia/gaia_oauth_client.cc b/chrome/common/net/gaia/gaia_oauth_client.cc
index eb4179dda5ddef7220e43b7d51cc26b34a6908c1..d657b3fa5e6c300d2ac5221aaabaac104764fa2d 100644
--- a/chrome/common/net/gaia/gaia_oauth_client.cc
+++ b/chrome/common/net/gaia/gaia_oauth_client.cc
@@ -34,8 +34,6 @@ class GaiaOAuthClient::Core
              request_context_getter_(request_context_getter),
              delegate_(NULL) {}
 
-  virtual ~Core() { }
-
   void GetTokensFromAuthCode(const OAuthClientInfo& oauth_client_info,
                              const std::string& auth_code,
                              int max_retries,
@@ -49,6 +47,9 @@ class GaiaOAuthClient::Core
   virtual void OnURLFetchComplete(const content::URLFetcher* source);
 
  private:
+  friend class base::RefCountedThreadSafe<Core>;
+  virtual ~Core() {}
+
   void MakeGaiaRequest(std::string post_body,
                        int max_retries,
                        GaiaOAuthClient::Delegate* delegate);