Remove Registry from registerMetadataConstant

pkg/compiler/lib/src/common/backend_api.dart

Index: pkg/compiler/lib/src/common/backend_api.dart
diff --git a/pkg/compiler/lib/src/common/backend_api.dart b/pkg/compiler/lib/src/common/backend_api.dart
index 5bbb2f0655fc8a834b644ec6d30716ef4bed56be..69031154c8decfc5b4e17c7c01bfbaf2af0d0624 100644
--- a/pkg/compiler/lib/src/common/backend_api.dart
+++ b/pkg/compiler/lib/src/common/backend_api.dart
@@ -131,11 +131,6 @@ abstract class Backend extends Target {
   /// Called during codegen when [constant] has been used.
   void registerCompileTimeConstant(ConstantValue constant, Registry registry) {}
 
-  /// Called during resolution when a constant value for [metadata] on
-  /// [annotatedElement] has been evaluated.
-  void registerMetadataConstant(MetadataAnnotation metadata,
-      Element annotatedElement, Registry registry) {}
-
   /// Called to notify to the backend that a class is being instantiated.
   // TODO(johnniwinther): Remove this. It's only called once for each [cls] and
   // only with [Compiler.globalDependencies] as [registry].