media config: expand is_encrypted to a struct.

chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc

Index: chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc
diff --git a/chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc b/chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc
index 4b15bcc532d54db65330edcfb7d1cc2638b26571..6aea10fb1a8360f88f38e66bbf0cff71a6d47549 100644
--- a/chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc
+++ b/chromecast/media/cma/pipeline/audio_decoder_software_wrapper.cc
@@ -59,7 +59,7 @@ bool AudioDecoderSoftwareWrapper::SetConfig(const AudioConfig& config) {
     return true;
   }
 
-  if (config.is_encrypted || !CreateSoftwareDecoder(config))
+  if (config.is_encrypted() || !CreateSoftwareDecoder(config))
     return false;
 
   output_config_.codec = media::kCodecPCM;
@@ -67,7 +67,7 @@ bool AudioDecoderSoftwareWrapper::SetConfig(const AudioConfig& config) {
   output_config_.channel_number = 2;
   output_config_.bytes_per_channel = 2;
   output_config_.samples_per_second = config.samples_per_second;
-  output_config_.is_encrypted = false;
+  output_config_.encryption_scheme = EncryptionScheme::unencrypted();
   return backend_decoder_->SetConfig(output_config_);
 }