Use FastaMessage instead of String. Part 1.

pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart
index 6bdf5529e24715ef431f791fe51db037d7f0f4e3..e41d72bb2b866a74d09b127642b68c79d70d07e1 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_named_type_builder.dart
@@ -6,7 +6,7 @@ library fasta.kernel_interface_type_builder;
 
 import 'package:kernel/ast.dart' show DartType, DynamicType, Supertype;
 
-import '../messages.dart' show deprecated_warning;
+import '../messages.dart' show templateTypeNotFound, warning;
 
 import 'kernel_builder.dart'
     show
@@ -27,18 +27,18 @@ class KernelNamedTypeBuilder
 
   KernelInvalidTypeBuilder buildInvalidType(String name) {
     // TODO(ahe): Record error instead of printing.
-    deprecated_warning(fileUri, charOffset, "Type not found: '$name'.");
+    warning(templateTypeNotFound.withArguments(name), charOffset, fileUri);
     return new KernelInvalidTypeBuilder(name, charOffset, fileUri);
   }
 
   DartType handleMissingType() {
     // TODO(ahe): Record error instead of printing.
-    deprecated_warning(fileUri, charOffset, "No type for: '$name'.");
+    warning(templateTypeNotFound.withArguments(name), charOffset, fileUri);
     return const DynamicType();
   }
 
   Supertype handleMissingSupertype() {
-    deprecated_warning(fileUri, charOffset, "No type for: '$name'.");
+    warning(templateTypeNotFound.withArguments(name), charOffset, fileUri);
     return null;
   }