Fix heapcheck errors

content/browser/streams/stream_context.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
 #define CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
 class BrowserContext;
 class StreamRegistry;
+struct StreamContextDeleter;
 
 // A context class that keeps track of StreamRegistry used by the chrome.
 // There is an instance associated with each BrowserContext. There could be
 // multiple URLRequestContexts in the same browser context that refers to the
 // same instance.
 //
 // All methods, except the ctor, are expected to be called on
 // the IO thread (unless specifically called out in doc comments).
 class StreamContext
     : public base::RefCountedThreadSafe<StreamContext,
-                                        BrowserThread::DeleteOnIOThread> {
+                                        StreamContextDeleter> {
  public:
   StreamContext();
 
   static StreamContext* GetFor(BrowserContext* browser_context);
 
   void InitializeOnIOThread();
 
   StreamRegistry* registry() const { return registry_.get(); }
 
  protected:
   virtual ~StreamContext();
 
  private:
   friend class base::DeleteHelper<StreamContext>;
-  friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
+  friend class base::RefCountedThreadSafe<StreamContext,
+                                          StreamContextDeleter>;
+  friend struct StreamContextDeleter;
+
+  void DeleteOnCorrectThread() const;
 
   scoped_ptr<StreamRegistry> registry_;
 };
 
+struct StreamContextDeleter {
+  static void Destruct(const StreamContext* context) {
+    context->DeleteOnCorrectThread();
+  }
+};
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_