Second patch in making destructors of refcounted objects private.

net/base/test_completion_callback_unittest.cc

 // Copyright (c) 2006-2008 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.
 
 // Illustrates how to use worker threads that issue completion callbacks
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "net/base/completion_callback.h"
 #include "net/base/test_completion_callback.h"
 #include "base/worker_pool.h"
@@ skipping 29 matching lines @@
 class ExampleEmployer::ExampleWorker
     : public base::RefCountedThreadSafe<ExampleWorker> {
  public:
   ExampleWorker(ExampleEmployer* employer, CompletionCallback* callback)
       : employer_(employer), callback_(callback),
         origin_loop_(MessageLoop::current()) {
   }
   void DoWork();
   void DoCallback();
  private:
+  friend class base::RefCountedThreadSafe<ExampleWorker>;
+
+  ~ExampleWorker() {}
+
   // Only used on the origin thread (where DoSomething was called).
   ExampleEmployer* employer_;
   CompletionCallback* callback_;
   // Used to post ourselves onto the origin thread.
   Lock origin_loop_lock_;
   MessageLoop* origin_loop_;
 };
 
 void ExampleEmployer::ExampleWorker::DoWork() {
   // Running on the worker thread
@@ skipping 51 matching lines @@
 TEST_F(TestCompletionCallbackTest, Simple) {
   ExampleEmployer boss;
   TestCompletionCallback callback;
   bool queued = boss.DoSomething(&callback);
   EXPECT_EQ(queued, true);
   int result = callback.WaitForResult();
   EXPECT_EQ(result, kMagicResult);
 }
 
 // TODO: test deleting ExampleEmployer while work outstanding