Second patch in making destructors of refcounted objects private.

net/http/http_cache_unittest.cc

Index: net/http/http_cache_unittest.cc
===================================================================
--- net/http/http_cache_unittest.cc	(revision 31079)
+++ net/http/http_cache_unittest.cc	(working copy)
@@ -61,9 +61,6 @@
     test_mode_ = t->test_mode;
   }
 
-  ~MockDiskEntry() {
-  }
-
   bool is_doomed() const { return doomed_; }
 
   virtual void Doom() {
@@ -249,6 +246,10 @@
   void set_fail_requests() { fail_requests_ = true; }
 
  private:
+  friend class base::RefCounted<MockDiskEntry>;
+
+  ~MockDiskEntry() {}
+
   // Unlike the callbacks for MockHttpTransaction, we want this one to run even
   // if the consumer called Close on the MockDiskEntry.  We achieve that by
   // leveraging the fact that this class is reference counted.