Remove deprecated_internalProblem.

pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart

Index: pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart b/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
index a7b0dd91dd712fdd120f8fa46ef86db166a9ded0..d73fe7b76252736ad7d1d8758ac3b86c8cbc21b0 100644
--- a/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
+++ b/pkg/front_end/lib/src/fasta/dill/dill_typedef_builder.dart
@@ -6,9 +6,6 @@ library fasta.dill_typedef_builder;
 
 import 'package:kernel/ast.dart' show DartType, Typedef;
 
-import 'package:front_end/src/fasta/deprecated_problems.dart'
-    show deprecated_internalProblem;
-
 import '../kernel/kernel_builder.dart'
     show
         KernelFunctionTypeAliasBuilder,
@@ -17,6 +14,8 @@ import '../kernel/kernel_builder.dart'
         MetadataBuilder,
         TypeVariableBuilder;
 
+import '../problems.dart' show unimplemented;
+
 import 'dill_library_builder.dart' show DillLibraryBuilder;
 
 class DillFunctionTypeAliasBuilder extends KernelFunctionTypeAliasBuilder {
@@ -25,17 +24,17 @@ class DillFunctionTypeAliasBuilder extends KernelFunctionTypeAliasBuilder {
             typedef);
 
   List<MetadataBuilder> get metadata {
-    return deprecated_internalProblem('Not implemented.');
+    return unimplemented("metadata", -1, null);
   }
 
   @override
   List<TypeVariableBuilder> get typeVariables {
-    return deprecated_internalProblem('Not implemented.');
+    return unimplemented("typeVariables", -1, null);
   }
 
   @override
   KernelFunctionTypeBuilder get type {
-    return deprecated_internalProblem('Not implemented.');
+    return unimplemented("type", -1, null);
   }
 
   @override