RefCounted types should not have public destructors, chrome/browser/ part 6

chrome/browser/io_thread.cc

 // Copyright (c) 2012 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 "chrome/browser/io_thread.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 62 matching lines @@
 
 // Custom URLRequestContext used by requests which aren't associated with a
 // particular profile. We need to use a subclass of URLRequestContext in order
 // to provide the correct User-Agent.
 class URLRequestContextWithUserAgent : public net::URLRequestContext {
  public:
   virtual const std::string& GetUserAgent(
       const GURL& url) const OVERRIDE {
     return content::GetUserAgent(url);
   }
+
+ protected:
+  virtual ~URLRequestContextWithUserAgent() {}
 };
 
 // Used for the "system" URLRequestContext. If this grows more complicated, then
 // consider inheriting directly from URLRequestContext rather than using
 // implementation inheritance.
 class SystemURLRequestContext : public URLRequestContextWithUserAgent {
  public:
   SystemURLRequestContext() {
 #if defined(USE_NSS)
     net::SetURLRequestContextForNSSHttpIO(this);
@@ skipping 520 matching lines @@
       new net::HttpNetworkLayer(
           new net::HttpNetworkSession(system_params)));
   globals_->system_ftp_transaction_factory.reset(
       new net::FtpNetworkLayer(globals_->host_resolver.get()));
   globals_->system_request_context =
       ConstructSystemRequestContext(globals_, net_log_);
 
   sdch_manager_->set_sdch_fetcher(
       new SdchDictionaryFetcher(system_url_request_context_getter_.get()));
 }