Revert of media config: expand is_encrypted to a struct.

media/mojo/common/media_type_converters.h

Index: media/mojo/common/media_type_converters.h
diff --git a/media/mojo/common/media_type_converters.h b/media/mojo/common/media_type_converters.h
index 6b5664b978e3399efb9c57e6b713c4fa8b68ff09..50cc30b8054516f464ff33fe4ef4aa6de012b29a 100644
--- a/media/mojo/common/media_type_converters.h
+++ b/media/mojo/common/media_type_converters.h
@@ -16,7 +16,6 @@
 class AudioDecoderConfig;
 class DecoderBuffer;
 class DecryptConfig;
-class EncryptionScheme;
 class VideoDecoderConfig;
 class VideoFrame;
 struct CdmConfig;
@@ -27,19 +26,6 @@
 // These are specializations of mojo::TypeConverter and have to be in the mojo
 // namespace.
 namespace mojo {
-
-template <>
-struct TypeConverter<media::interfaces::EncryptionSchemePtr,
-                     media::EncryptionScheme> {
-  static media::interfaces::EncryptionSchemePtr Convert(
-      const media::EncryptionScheme& input);
-};
-template <>
-struct TypeConverter<media::EncryptionScheme,
-                     media::interfaces::EncryptionSchemePtr> {
-  static media::EncryptionScheme Convert(
-      const media::interfaces::EncryptionSchemePtr& input);
-};
 
 template <>
 struct TypeConverter<media::interfaces::SubsampleEntryPtr,