Fix the flushing process of DecryptingAudioDecoder.

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 8a898147e5a2d9fc531db8e5690e6365ce9b4ee4..bd4975302b47d35c3bdb9486691c7b21f01ecdfd 100644
--- a/media/filters/decrypting_audio_decoder.cc
+++ b/media/filters/decrypting_audio_decoder.cc
@@ -297,11 +297,9 @@ void DecryptingAudioDecoder::DeliverFrame(
     if (scoped_pending_buffer_to_decode->end_of_stream()) {
       state_ = kDecodeFinished;
       output_cb_.Run(AudioBuffer::CreateEOSBuffer());
-      base::ResetAndReturn(&decode_cb_).Run(kOk);
-      return;
+    } else {
+      state_ = kIdle;
     }
-
-    state_ = kIdle;
     base::ResetAndReturn(&decode_cb_).Run(kOk);
     return;
   }
@@ -310,6 +308,14 @@ void DecryptingAudioDecoder::DeliverFrame(
   DCHECK(!frames.empty());
   ProcessDecodedFrames(frames);
 
+  if (scoped_pending_buffer_to_decode->end_of_stream()) {
+    // Set |pending_buffer_to_decode_| back as we need to keep flushing the
+    // decryptor until kNeedMoreData is returned.
+    pending_buffer_to_decode_ = scoped_pending_buffer_to_decode;
+    DecodePendingBuffer();
+    return;
+  }
+
   state_ = kIdle;
   base::ResetAndReturn(&decode_cb_).Run(kOk);
 }