Fix too generic type for 'implementsFunction'.

pkg/compiler/lib/src/serialization/modelz.dart

Index: pkg/compiler/lib/src/serialization/modelz.dart
diff --git a/pkg/compiler/lib/src/serialization/modelz.dart b/pkg/compiler/lib/src/serialization/modelz.dart
index 07cf4e6e7b537419dd8f3804ad6a8b7370e73232..c31ee4af34453b02aca007908edcfc8a73862ca8 100644
--- a/pkg/compiler/lib/src/serialization/modelz.dart
+++ b/pkg/compiler/lib/src/serialization/modelz.dart
@@ -16,6 +16,7 @@ import '../compiler.dart'
     show Compiler;
 import '../constants/constructors.dart';
 import '../constants/expressions.dart';
+import '../core_types.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../elements/modelx.dart' show
@@ -853,7 +854,7 @@ class ClassElementZ extends DeserializedElementZ
   bool get hasLocalScopeMembers => _unsupported('hasLocalScopeMembers');
 
   @override
-  bool implementsFunction(Compiler compiler) {
+  bool implementsFunction(CoreClasses coreClasses) {
     return _unsupported('implementsFunction');
   }
 
@@ -1572,4 +1573,4 @@ class PrefixElementZ extends DeserializedElementZ
   Element lookupLocalMember(String memberName) {
     return _unsupported('lookupLocalMember');
   }
-}
+}