AudioConverter: Express delay in frames rather than msec.

media/base/loopback_audio_converter.h

 // 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.
 
 #ifndef MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_
 #define MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_
 
 #include "base/macros.h"
 #include "media/base/audio_converter.h"
 
@@ skipping 17 matching lines @@
     audio_converter_.AddInput(input);
   }
 
   void RemoveInput(AudioConverter::InputCallback* input) {
     audio_converter_.RemoveInput(input);
   }
 
   bool empty() { return audio_converter_.empty(); }
 
  private:
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+  double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
 
   AudioConverter audio_converter_;
 
   DISALLOW_COPY_AND_ASSIGN(LoopbackAudioConverter);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_