Const-ify RefCountedThreadSafe::AddRef and Release.

chrome/browser/net/chrome_url_request_context.h

 // 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.
 
 #ifndef CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #define CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 222 matching lines @@
 
   static void RegisterUserPrefs(PrefService* user_prefs);
 
   // Note that GetURLRequestContext() can only be called from the IO
   // thread (it will assert otherwise). GetCookieStore() and
   // GetIOMessageLoopProxy however can be called from any thread.
   //
   // URLRequestContextGetter implementation.
   virtual URLRequestContext* GetURLRequestContext();
   virtual net::CookieStore* GetCookieStore();
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy();
+  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const;
 
   // Convenience overload of GetURLRequestContext() that returns a
   // ChromeURLRequestContext* rather than a URLRequestContext*.
   ChromeURLRequestContext* GetIOContext() {
     return reinterpret_cast<ChromeURLRequestContext*>(GetURLRequestContext());
   }
 
   // Create an instance for use with an 'original' (non-OTR) profile. This is
   // expected to get called on the UI thread.
   static ChromeURLRequestContextGetter* CreateOriginal(
@@ skipping 121 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(ChromeURLRequestContextFactory);
 };
 
 // Creates a proxy configuration from proxy-related preferences fetched
 // from |pref_service|. The relevant preferences in |pref_service| are
 // initialized from the process' command line or by applicable proxy policies.
 net::ProxyConfig* CreateProxyConfig(const PrefService* pref_service);
 
 #endif  // CHROME_BROWSER_NET_CHROME_URL_REQUEST_CONTEXT_H_