Remove unused AudioBuffersState member.

media/audio/audio_buffers_state.h

Index: media/audio/audio_buffers_state.h
===================================================================
--- media/audio/audio_buffers_state.h	(revision 126381)
+++ media/audio/audio_buffers_state.h	(working copy)
@@ -5,17 +5,17 @@
 #ifndef MEDIA_AUDIO_AUDIO_BUFFERS_STATE_H_
 #define MEDIA_AUDIO_AUDIO_BUFFERS_STATE_H_
 
-#include "base/time.h"
 #include "media/base/media_export.h"
 
-// AudioBuffersState struct stores current state of audio buffers along with
-// the timestamp of the moment this state corresponds to. It is used for audio
-// synchronization.
+// AudioBuffersState struct stores current state of audio buffers.
+// It is used for audio synchronization.
 struct MEDIA_EXPORT AudioBuffersState {
   AudioBuffersState();
   AudioBuffersState(int pending_bytes, int hardware_delay_bytes);
 
-  int total_bytes();
+  int total_bytes() {
+    return pending_bytes + hardware_delay_bytes;
+  }
 
   // Number of bytes we currently have in our software buffer.
   int pending_bytes;
@@ -23,12 +23,6 @@
   // Number of bytes that have been written to the device, but haven't
   // been played yet.
   int hardware_delay_bytes;
-
-  // Timestamp of the moment when the buffers state was captured. It is used
-  // to account for the time it takes to deliver AudioBuffersState from
-  // the browser process to the renderer.
-  base::Time timestamp;
 };
 
-
 #endif  // MEDIA_AUDIO_AUDIO_BUFFERS_STATE_H_