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

chrome/browser/memory_purger.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/memory_purger.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/threading/thread.h"
@@ skipping 28 matching lines @@
   PurgeMemoryIOHelper() {
     safe_browsing_service_ = g_browser_process->safe_browsing_service();
   }
 
   void AddRequestContextGetter(
       scoped_refptr<net::URLRequestContextGetter> request_context_getter);
 
   void PurgeMemoryOnIOThread();
 
  private:
+  friend class base::RefCountedThreadSafe<PurgeMemoryIOHelper>;
+
+  virtual ~PurgeMemoryIOHelper() {}
+
   typedef scoped_refptr<net::URLRequestContextGetter> RequestContextGetter;
+  std::vector<RequestContextGetter> request_context_getters_;
 
-  std::vector<RequestContextGetter> request_context_getters_;
   scoped_refptr<SafeBrowsingService> safe_browsing_service_;
 
   DISALLOW_COPY_AND_ASSIGN(PurgeMemoryIOHelper);
 };
 
 void PurgeMemoryIOHelper::AddRequestContextGetter(
     scoped_refptr<net::URLRequestContextGetter> request_context_getter) {
   request_context_getters_.push_back(request_context_getter);
 }
 
@@ skipping 86 matching lines @@
           content::RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance())
     PurgeRendererForHost(i.GetCurrentValue());
 }
 
 // static
 void MemoryPurger::PurgeRendererForHost(content::RenderProcessHost* host) {
   // Direct the renderer to free everything it can.
   host->Send(new ChromeViewMsg_PurgeMemory());
 }