MPL Version change
MPL Version change

- Up-version-ed the media player library from 0.3.0 to 0.5.0
gagangagan/cast-custom-receiver,KuJyoti/sample_receiver,KuJyoti/chrome_sample_receiver,gagangagan/cast-custom-receiver,pengying/cast-custom-receiver,willm/cast-custom-receiver,KuJyoti/chrome_sample_receiver,KuJyoti/sample_receiver,codeprogression/cast-custom-receiver,almartin82/cast-custom-receiver,willm/cast-custom-receiver,codeprogression/cast-custom-receiver,almartin82/cast-custom-receiver