Deprecate all diagnostics methods that use strings.

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 2d7b21bd7b95936a2596729c3ef6f4c00dc5ed80..a7b0dd91dd712fdd120f8fa46ef86db166a9ded0 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
@@ -6,7 +6,8 @@ library fasta.dill_typedef_builder;
 
 import 'package:kernel/ast.dart' show DartType, Typedef;
 
-import 'package:front_end/src/fasta/errors.dart' show internalError;
+import 'package:front_end/src/fasta/deprecated_problems.dart'
+    show deprecated_internalProblem;
 
 import '../kernel/kernel_builder.dart'
     show
@@ -24,17 +25,17 @@ class DillFunctionTypeAliasBuilder extends KernelFunctionTypeAliasBuilder {
             typedef);
 
   List<MetadataBuilder> get metadata {
-    return internalError('Not implemented.');
+    return deprecated_internalProblem('Not implemented.');
   }
 
   @override
   List<TypeVariableBuilder> get typeVariables {
-    return internalError('Not implemented.');
+    return deprecated_internalProblem('Not implemented.');
   }
 
   @override
   KernelFunctionTypeBuilder get type {
-    return internalError('Not implemented.');
+    return deprecated_internalProblem('Not implemented.');
   }
 
   @override