Deprecate all diagnostics methods that use strings.

pkg/front_end/test/fasta/testing/suite.dart

 // Copyright (c) 2016, 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 fasta.testing.suite;
 
 import 'dart:async' show Future;
 
 import 'dart:io' show File;
 
@@ skipping 14 matching lines @@
         Chain,
         ChainContext,
         ExpectationSet,
         Result,
         Step,
         TestDescription,
         StdioProcess;
 
 import 'package:front_end/src/fasta/compiler_context.dart' show CompilerContext;
 
-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/kernel_chain.dart'
     show MatchExpectation, Print, Verify, WriteDill;
 
 import 'package:front_end/src/fasta/ticker.dart' show Ticker;
 
 import 'package:front_end/src/fasta/translate_uri.dart' show TranslateUri;
 
 import 'package:analyzer/src/fasta/analyzer_target.dart' show AnalyzerTarget;
 
@@ skipping 216 matching lines @@
         p = await sourceTarget.buildProgram(trimDependencies: true);
         instrumentation?.finish();
         if (instrumentation != null && instrumentation.hasProblems) {
           if (updateComments) {
             await instrumentation.fixSource(description.uri, false);
           } else {
             return fail(null, instrumentation.problemsAsString);
           }
         }
       }
-    } on InputError catch (e, s) {
+    } on deprecated_InputError catch (e, s) {
       return fail(null, e.error, s);
     }
     context.programToTarget.clear();
     context.programToTarget[p] = sourceTarget;
     return pass(p);
   }
 }
 
 class Transform extends Step<Program, Program, FastaContext> {
   const Transform();
@@ skipping 33 matching lines @@
     }
   }
 
   void performGlobalTransformations(CoreTypes coreTypes, Program program,
       {void logger(String msg)}) {
     if (enabled) {
       super.performGlobalTransformations(coreTypes, program, logger: logger);
     }
   }
 }