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

webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc

Index: webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc
diff --git a/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc b/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc
index eba597d9e3037a12cd80b2e4e592ce07a087b90d..df35f2e7048fbcf57a08cb6cd89a23668289293d 100644
--- a/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc
+++ b/webkit/media/crypto/ppapi/ffmpeg_cdm_audio_decoder.cc
@@ -188,7 +188,7 @@ cdm::Status FFmpegCdmAudioDecoder::DecodeBuffer(
     int64_t input_timestamp,
     cdm::AudioFrames* decoded_frames) {
   DVLOG(1) << "DecodeBuffer()";
-  const bool is_end_of_stream = compressed_buffer_size == 0;
+  const bool is_end_of_stream = !compressed_buffer;
   base::TimeDelta timestamp =
       base::TimeDelta::FromMicroseconds(input_timestamp);