Remove prefixed EME.

media/base/key_systems.h

Index: media/base/key_systems.h
diff --git a/media/base/key_systems.h b/media/base/key_systems.h
index dcdd254842d9203f882fbd60347993d7b6762cee..1163dc81175911dbf1f705f4a6e4f2a9b0b02829 100644
--- a/media/base/key_systems.h
+++ b/media/base/key_systems.h
@@ -16,8 +16,7 @@
 
 namespace media {
 
-// Provides an interface for querying registered key systems. The exposed API is
-// only intended to support unprefixed EME.
+// Provides an interface for querying registered key systems.
 //
 // Many of the original static methods are still available, they should be
 // migrated into this interface over time (or removed).
@@ -71,39 +70,13 @@ class MEDIA_EXPORT KeySystems {
   virtual ~KeySystems() {};
 };
 
-// Prefixed EME API only supports prefixed (webkit-) key system name for
-// certain key systems. But internally only unprefixed key systems are
-// supported. The following two functions help convert between prefixed and
-// unprefixed key system names.
-
-// Gets the unprefixed key system name for |key_system|.
-MEDIA_EXPORT std::string GetUnprefixedKeySystemName(
-    const std::string& key_system);
-
-// Gets the prefixed key system name for |key_system|.
-MEDIA_EXPORT std::string GetPrefixedKeySystemName(
-    const std::string& key_system);
-
+// TODO(ddorwin): WebContentDecryptionModuleSessionImpl::initializeNewSession()
+// is violating this rule! https://crbug.com/249976.
 // Use for prefixed EME only!
 MEDIA_EXPORT bool IsSupportedKeySystemWithInitDataType(
     const std::string& key_system,
     EmeInitDataType init_data_type);
 
-// Use for prefixed EME only!
-// Returns whether |key_system| is a real supported key system that can be
-// instantiated.
-// Abstract parent |key_system| strings will return false.
-MEDIA_EXPORT bool PrefixedIsSupportedConcreteKeySystem(
-    const std::string& key_system);
-
-// Use for prefixed EME only!
-// Returns whether |key_system| supports the specified media type and codec(s).
-// To be used with prefixed EME only as it generates UMAs based on the query.
-MEDIA_EXPORT bool PrefixedIsSupportedKeySystemWithMediaMimeType(
-    const std::string& mime_type,
-    const std::vector<std::string>& codecs,
-    const std::string& key_system);
-
 // Returns a name for |key_system| suitable to UMA logging.
 MEDIA_EXPORT std::string GetKeySystemNameForUMA(const std::string& key_system);