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

chrome/common/net/url_request_context_getter.h

 // Copyright (c) 2009 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_COMMON_NET_URL_REQUEST_CONTEXT_GETTER_H_
 #define CHROME_COMMON_NET_URL_REQUEST_CONTEXT_GETTER_H_
 #pragma once
 
 #include "base/ref_counted.h"
 #include "base/task.h"
@@ skipping 15 matching lines @@
                                         URLRequestContextGetterTraits> {
  public:
   virtual URLRequestContext* GetURLRequestContext() = 0;
 
   // Defaults to GetURLRequestContext()->cookie_store(), but
   // implementations can override it.
   virtual net::CookieStore* GetCookieStore();
   // Returns a MessageLoopProxy corresponding to the thread on which the
   // request IO happens (the thread on which the returned URLRequestContext
   // may be used).
-  virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() = 0;
+  virtual scoped_refptr<base::MessageLoopProxy>
+      GetIOMessageLoopProxy() const = 0;
 
   // Controls whether or not the URLRequestContextGetter considers itself to be
   // the the "main" URLRequestContextGetter.  Note that each Profile will have a
   // "default" URLRequestContextGetter.  Therefore, "is_main" refers to the
   // default URLRequestContextGetter for the "main" Profile.
   // TODO(willchan): Move this code to ChromeURLRequestContextGetter, since this
   // ia a browser process specific concept.
   void set_is_main(bool is_main) { is_main_ = is_main; }
 
  protected:
-  friend class DeleteTask<URLRequestContextGetter>;
+  friend class DeleteTask<const URLRequestContextGetter>;
   friend struct URLRequestContextGetterTraits;
 
   URLRequestContextGetter();
   virtual ~URLRequestContextGetter();
 
   bool is_main() const { return is_main_; }
 
  private:
   // OnDestruct is meant to ensure deletion on the thread on which the request
   // IO happens.
-  void OnDestruct();
+  void OnDestruct() const;
 
   // Indicates whether or not this is the default URLRequestContextGetter for
   // the main Profile.
   bool is_main_;
 };
 
 struct URLRequestContextGetterTraits {
-  static void Destruct(URLRequestContextGetter* context_getter) {
+  static void Destruct(const URLRequestContextGetter* context_getter) {
     context_getter->OnDestruct();
   }
 };
 
 #endif  // CHROME_COMMON_NET_URL_REQUEST_CONTEXT_GETTER_H_