Revert "Revert "Const-ify RefCountedThreadSafe::AddRef and Release.""

chrome/common/net/url_fetcher_unittest.cc

 // Copyright (c) 2010 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.
 
 #include "base/message_loop_proxy.h"
 #include "base/thread.h"
 #include "base/waitable_event.h"
 #include "chrome/common/chrome_plugin_lib.h"
 #include "chrome/common/net/url_fetcher.h"
 #include "chrome/common/net/url_fetcher_protect.h"
@@ skipping 16 matching lines @@
  public:
   explicit TestURLRequestContextGetter(
       base::MessageLoopProxy* io_message_loop_proxy)
           : io_message_loop_proxy_(io_message_loop_proxy) {
   }
   virtual URLRequestContext* GetURLRequestContext() {
     if (!context_)
       context_ = new TestURLRequestContext();
     return context_;
   }
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     return io_message_loop_proxy_;
   }
 
  protected:
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
 
  private:
   ~TestURLRequestContextGetter() {}
 
   scoped_refptr<URLRequestContext> context_;
@@ skipping 144 matching lines @@
       : io_message_loop_proxy_(io_message_loop_proxy),
         context_created_(false, false) {
   }
   virtual URLRequestContext* GetURLRequestContext() {
     if (!context_) {
       context_ = new CancelTestURLRequestContext();
       context_created_.Signal();
     }
     return context_;
   }
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     return io_message_loop_proxy_;
   }
   void WaitForContextCreation() {
     context_created_.Wait();
   }
 
  private:
   ~CancelTestURLRequestContextGetter() {}
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
@@ skipping 391 matching lines @@
   // time difference from now).
 
   base::Thread t("URLFetcher test thread");
   ASSERT_TRUE(t.Start());
   t.message_loop()->PostTask(FROM_HERE, new FetcherWrapperTask(this, url));
 
   MessageLoop::current()->Run();
 }
 
 }  // namespace.