Strip out stream counting from AudioRendererHost.

media/audio/audio_streams_tracker.h

-// Copyright 2015 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 MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_
-#define MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_
-
-#include <stddef.h>
-
-#include "base/gtest_prod_util.h"
-#include "base/macros.h"
-#include "base/threading/thread_checker.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-// Tracks the maximum number of simultaneous streams that was ever registered.
-// All functions must be called on the same thread.
-class MEDIA_EXPORT AudioStreamsTracker {
- public:
-  AudioStreamsTracker();
-  ~AudioStreamsTracker();
-
-  // Increases/decreases current stream count. Updates max stream count if
-  // current count is larger.
-  void IncreaseStreamCount();
-  void DecreaseStreamCount(size_t count = 1);
-
-  // Resets the max stream count, i.e. sets it to the current stream count.
-  void ResetMaxStreamCount();
-
-  size_t max_stream_count() const;
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(AudioStreamsTrackerTest, IncreaseAndDecreaseOnce);
-  FRIEND_TEST_ALL_PREFIXES(AudioStreamsTrackerTest,
-                           IncreaseAndDecreaseMultiple);
-
-  // Confirms single-threaded access.
-  base::ThreadChecker thread_checker_;
-
-  // Stores the current and maximum number of streams.
-  size_t current_stream_count_;
-  size_t max_stream_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(AudioStreamsTracker);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_AUDIO_AUDIO_STREAMS_TRACKER_H_