Deprecate all diagnostics methods that use strings.

pkg/compiler/tool/generate_kernel.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 file.
 
 /// Helper to run fasta with the right target configuration to build dart2js
 /// applications using the dart2js platform libraries.
 // TODO(sigmund): delete this file once we can configure fasta directly on the
 // command line.
 library compiler.tool.generate_kernel;
 
 import 'dart:io' show exitCode;
 
 import 'package:front_end/src/fasta/compiler_command_line.dart'
     show CompilerCommandLine;
 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/ticker.dart' show Ticker;
 import 'package:compiler/src/kernel/fasta_support.dart' show Dart2jsCompileTask;
 
 main(List<String> arguments) async {
   try {
     await CompilerCommandLine.withGlobalOptions("generate_kernel", arguments,
         (CompilerContext c) async {
       if (c.options.verbose) {
         print("Compiling directly to Kernel: ${arguments.join(' ')}");
       }
       var task =
           new Dart2jsCompileTask(c, new Ticker(isVerbose: c.options.verbose));
       await task.compile();
     });
-  } on InputError catch (e) {
+  } on deprecated_InputError catch (e) {
     exitCode = 1;
-    print(e.format());
+    print(e.deprecated_format());
     return null;
   }
 }