Deprecate all diagnostics methods that use strings.

pkg/kernel/test/closures/suite.dart

 // Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 library test.kernel.closures.suite;
 
 import 'dart:async' show Future;
 
 import 'package:front_end/physical_file_system.dart' show PhysicalFileSystem;
 
@@ skipping 15 matching lines @@
 
 import 'package:front_end/src/fasta/ticker.dart' show Ticker;
 
 import 'package:front_end/src/fasta/dill/dill_target.dart' show DillTarget;
 
 import 'package:front_end/src/fasta/kernel/kernel_target.dart'
     show KernelTarget;
 
 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';
 
 import 'package:kernel/kernel.dart' show loadProgramFromBinary;
 
 import 'package:kernel/target/targets.dart' show TargetFlags;
 
 import 'package:kernel/target/vm_fasta.dart' show VmFastaTarget;
 
 const String STRONG_MODE = " strong mode ";
@@ skipping 62 matching lines @@
     dillTarget.loader.appendLibraries(platform);
     KernelTarget sourceTarget = new KernelTarget(
         PhysicalFileSystem.instance, dillTarget, context.uriTranslator);
 
     Program p;
     try {
       sourceTarget.read(description.uri);
       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);
   }
 }
 
 class ClosureConversion
     extends Step<Program, Program, ClosureConversionContext> {
   const ClosureConversion();
 
   String get name => "closure conversion";
 
   Future<Result<Program>> run(
       Program program, ClosureConversionContext testContext) async {
     try {
       CoreTypes coreTypes = new CoreTypes(program);
       Library library = program.libraries
           .firstWhere((Library library) => library.importUri.scheme != "dart");
       closure_conversion.transformLibraries(coreTypes, <Library>[library]);
       return pass(program);
     } catch (e, s) {
       return crash(e, s);
     }
   }
 }
 
 main(List<String> arguments) => runMe(arguments, createContext, "testing.json");