Revert of Remove AudioBuffer::set_duration(), instead base on frames.

media/filters/decrypting_audio_decoder_unittest.cc

Index: media/filters/decrypting_audio_decoder_unittest.cc
diff --git a/media/filters/decrypting_audio_decoder_unittest.cc b/media/filters/decrypting_audio_decoder_unittest.cc
index 007a288e1592769d07bdc9542a30e3b3c48d81cc..d7f1f9dec1e9a42a2c39a8b519352f6168ddbfcd 100644
--- a/media/filters/decrypting_audio_decoder_unittest.cc
+++ b/media/filters/decrypting_audio_decoder_unittest.cc
@@ -104,6 +104,7 @@
                                                     channels,
                                                     kSampleRate,
                                                     kFakeAudioFrameSize,
+                                                    kNoTimestamp(),
                                                     kNoTimestamp());
     decoded_frame_list_.push_back(decoded_frame_);
 
@@ -362,12 +363,14 @@
       ChannelLayoutToChannelCount(config_.channel_layout()),
       kSampleRate,
       kFakeAudioFrameSize,
+      kNoTimestamp(),
       kNoTimestamp());
   scoped_refptr<AudioBuffer> frame_b = AudioBuffer::CreateEmptyBuffer(
       config_.channel_layout(),
       ChannelLayoutToChannelCount(config_.channel_layout()),
       kSampleRate,
       kFakeAudioFrameSize,
+      kNoTimestamp(),
       kNoTimestamp());
   decoded_frame_list_.push_back(frame_a);
   decoded_frame_list_.push_back(frame_b);