Const-ify RefCountedThreadSafe::AddRef and Release.

chrome/browser/sync/glue/http_bridge.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_GLUE_HTTP_BRIDGE_H_
 #define CHROME_BROWSER_SYNC_GLUE_HTTP_BRIDGE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 67 matching lines @@
   class RequestContextGetter : public URLRequestContextGetter {
    public:
     explicit RequestContextGetter(
         URLRequestContextGetter* baseline_context_getter);
 
     void set_user_agent(const std::string& ua) { user_agent_ = ua; }
     bool is_user_agent_set() const { return !user_agent_.empty(); }
 
     // URLRequestContextGetter implementation.
     virtual URLRequestContext* GetURLRequestContext();
-    virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy();
+    virtual scoped_refptr<base::MessageLoopProxy> GetIOMessageLoopProxy() const;
 
    private:
     ~RequestContextGetter() {}
 
     // User agent to apply to the URLRequestContext.
     std::string user_agent_;
 
     scoped_refptr<URLRequestContextGetter> baseline_context_getter_;
 
     // Lazily initialized by GetURLRequestContext().
@@ skipping 104 matching lines @@
   // common components.
   HttpBridge::RequestContextGetter* GetRequestContextGetter();
   scoped_refptr<HttpBridge::RequestContextGetter> request_context_getter_;
   DISALLOW_COPY_AND_ASSIGN(HttpBridgeFactory);
 };
 
 }  //  namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_HTTP_BRIDGE_H_