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

chrome_frame/metrics_service.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.
 
 
 //------------------------------------------------------------------------------
 // Description of the life cycle of a instance of MetricsService.
 //
 //  OVERVIEW
 //
@@ skipping 192 matching lines @@
  public:
   explicit ChromeFrameUploadRequestContextGetter(MessageLoop* io_loop)
       : io_loop_(io_loop) {}
 
   virtual URLRequestContext* GetURLRequestContext() {
     if (!context_)
       context_ = new ChromeFrameUploadRequestContext(io_loop_);
     return context_;
   }
 
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() {
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const {
     if (!io_message_loop_proxy_.get()) {
       io_message_loop_proxy_ = base::MessageLoopProxy::CreateForCurrentThread();
     }
     return io_message_loop_proxy_;
   }
 
  private:
   ~ChromeFrameUploadRequestContextGetter() {
     DVLOG(1) << __FUNCTION__;
   }
 
   scoped_refptr<URLRequestContext> context_;
-  scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  mutable scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
   MessageLoop* io_loop_;
 };
 
 // This class provides functionality to upload the ChromeFrame UMA data to the
 // server. An instance of this class is created whenever we have data to be
 // uploaded to the server.
 class ChromeFrameMetricsDataUploader
     : public URLFetcher::Delegate,
       public base::RefCountedThreadSafe<ChromeFrameMetricsDataUploader>,
       public CWindowImpl<ChromeFrameMetricsDataUploader>,
@@ skipping 361 matching lines @@
     version += "-F";
     if (!version_info.IsOfficialBuild())
       version.append("-devel");
     return version;
   } else {
     NOTREACHED() << "Unable to retrieve version string.";
   }
 
   return std::string();
 }