Revert 187230

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;
-
-// 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> {
- 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>;
-
-  scoped_ptr<StreamRegistry> registry_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_
-