Merge pull request graphql-java#3739 from gnawf/remove-extension-interface

Remove SDLExtensionDefinition from InterfaceTypeDefinition

Author: dondonz

src/main/java/graphql/language/InterfaceTypeDefinition.java

@@ -21,7 +21,7 @@
 import static graphql.language.NodeChildrenContainer.newNodeChildrenContainer;
 
 @PublicApi
-public class InterfaceTypeDefinition extends AbstractDescribedNode<InterfaceTypeDefinition> implements ImplementingTypeDefinition<InterfaceTypeDefinition>, DirectivesContainer<InterfaceTypeDefinition>, NamedNode<InterfaceTypeDefinition>, SDLExtensionDefinition {
+public class InterfaceTypeDefinition extends AbstractDescribedNode<InterfaceTypeDefinition> implements ImplementingTypeDefinition<InterfaceTypeDefinition>, DirectivesContainer<InterfaceTypeDefinition>, NamedNode<InterfaceTypeDefinition> {
 
     private final String name;
     private final ImmutableList<Type> implementz;

src/main/java/graphql/language/InterfaceTypeExtensionDefinition.java

@@ -14,7 +14,7 @@
 import static graphql.collect.ImmutableKit.emptyList;
 
 @PublicApi
-public class InterfaceTypeExtensionDefinition extends InterfaceTypeDefinition {
+public class InterfaceTypeExtensionDefinition extends InterfaceTypeDefinition implements SDLExtensionDefinition {
 
     @Internal
     protected InterfaceTypeExtensionDefinition(String name,