Tighten up media::DecoderBuffer API contract for end of stream buffers (round 2).

media/filters/decrypting_audio_decoder.cc

Index: media/filters/decrypting_audio_decoder.cc
diff --git a/media/filters/decrypting_audio_decoder.cc b/media/filters/decrypting_audio_decoder.cc
index 1bb04b3a17aea5abeb8a6d469eb4dbff07aa174c..6fb8cdd80c30c23e39ffc4b8f8700857f0bb543e 100644
--- a/media/filters/decrypting_audio_decoder.cc
+++ b/media/filters/decrypting_audio_decoder.cc
@@ -342,10 +342,15 @@ void DecryptingAudioDecoder::DoDecryptAndDecodeBuffer(
 void DecryptingAudioDecoder::DecodePendingBuffer() {
   DCHECK(message_loop_->BelongsToCurrentThread());
   DCHECK_EQ(state_, kPendingDecode) << state_;
+
+  int buffer_size = 0;
+  if (!pending_buffer_to_decode_->IsEndOfStream()) {
+    buffer_size = pending_buffer_to_decode_->GetDataSize();
+  }
+
   decryptor_->DecryptAndDecodeAudio(
       pending_buffer_to_decode_,
-      base::Bind(&DecryptingAudioDecoder::DeliverFrame, this,
-                 pending_buffer_to_decode_->GetDataSize()));
+      base::Bind(&DecryptingAudioDecoder::DeliverFrame, this, buffer_size));
 }
 
 void DecryptingAudioDecoder::DeliverFrame(