AudioBuffer: remove PadSilence()

media/base/audio_buffer.h

Index: media/base/audio_buffer.h
diff --git a/media/base/audio_buffer.h b/media/base/audio_buffer.h
index e14f08222dd5a3c0aaf7eb57ea1bf95b98a03067..d03a02ed4fcfa1ea7ffd2bbae91e0c669a37cb2a 100644
--- a/media/base/audio_buffer.h
+++ b/media/base/audio_buffer.h
@@ -94,10 +94,6 @@ class MEDIA_EXPORT AudioBuffer
                   int dest_frame_offset,
                   AudioBus* dest);
 
-  // Add |silence_frames| frames of silence to the start of the buffer. Silence
-  // padding can be removed using any of the Trim*() methods.
-  void PadStart(int silence_frames);
-
   // Trim an AudioBuffer by removing |frames_to_trim| frames from the start.
   // Timestamp and duration are adjusted to reflect the fewer frames.
   // Note that repeated calls to TrimStart() may result in timestamp() and
@@ -165,10 +161,6 @@ class MEDIA_EXPORT AudioBuffer
 
   virtual ~AudioBuffer();
 
-  void AllocateAndCopy(const uint8_t* const* data,
-                       int frame_count,
-                       int silence_frames);
-
   const SampleFormat sample_format_;
   const ChannelLayout channel_layout_;
   const int channel_count_;