Deprecate all diagnostics methods that use strings.

pkg/kernel/test/closures_initializers/suite.dart

Index: pkg/kernel/test/closures_initializers/suite.dart
diff --git a/pkg/kernel/test/closures_initializers/suite.dart b/pkg/kernel/test/closures_initializers/suite.dart
index af63e91dc3666711e357d94f23345f05f8c4dc3f..d42d163b2eb5a94f9218eb1d3a14c7e98c956aaf 100644
--- a/pkg/kernel/test/closures_initializers/suite.dart
+++ b/pkg/kernel/test/closures_initializers/suite.dart
@@ -36,7 +36,8 @@ import 'package:front_end/src/fasta/kernel/kernel_target.dart'
 
 import 'package:front_end/src/fasta/translate_uri.dart' show TranslateUri;
 
-import 'package:front_end/src/fasta/errors.dart' show InputError;
+import 'package:front_end/src/fasta/deprecated_problems.dart'
+    show deprecated_InputError;
 
 import 'package:front_end/src/fasta/testing/patched_sdk_location.dart';
 
@@ -122,7 +123,7 @@ class FastaCompile
       await dillTarget.buildOutlines();
       await sourceTarget.buildOutlines();
       p = await sourceTarget.buildProgram();
-    } on InputError catch (e, s) {
+    } on deprecated_InputError catch (e, s) {
       return fail(null, e.error, s);
     }
     return pass(p);