Deprecate all diagnostics methods that use strings.

pkg/front_end/lib/src/fasta/kernel/kernel_type_variable_builder.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 file.
 
 library fasta.kernel_type_variable_builder;
 
 import 'package:kernel/ast.dart'
     show DartType, TypeParameter, TypeParameterType;
 
-import '../errors.dart' show inputError;
+import '../deprecated_problems.dart' show deprecated_inputError;
 
 import 'kernel_builder.dart'
     show
         KernelClassBuilder,
         KernelLibraryBuilder,
         KernelNamedTypeBuilder,
         KernelTypeBuilder,
         LibraryBuilder,
         TypeVariableBuilder;
 
 class KernelTypeVariableBuilder
     extends TypeVariableBuilder<KernelTypeBuilder, DartType> {
   final TypeParameter parameter;
 
   KernelTypeVariableBuilder(
       String name, KernelLibraryBuilder compilationUnit, int charOffset,
       [KernelTypeBuilder bound])
       : parameter = new TypeParameter(name, null),
         super(name, bound, compilationUnit, charOffset);
 
   TypeParameter get target => parameter;
 
   DartType buildType(
       LibraryBuilder library, List<KernelTypeBuilder> arguments) {
     if (arguments != null) {
-      library.addWarning(arguments.first.charOffset,
+      library.deprecated_addWarning(arguments.first.charOffset,
           "Can't use type arguments with type parameter $parameter",
           fileUri: fileUri);
     }
     return new TypeParameterType(parameter);
   }
 
   DartType buildTypesWithBuiltArguments(
       LibraryBuilder library, List<DartType> arguments) {
     if (arguments != null) {
-      return inputError(null, null,
+      return deprecated_inputError(null, null,
           "Can't use type arguments with type parameter $parameter");
     } else {
       return buildType(library, null);
     }
   }
 
   KernelTypeBuilder asTypeBuilder() {
     return new KernelNamedTypeBuilder(name, null, -1, null)..builder = this;
   }
 
   void finish(LibraryBuilder library, KernelClassBuilder object) {
     parameter.bound ??=
         bound?.build(library) ?? object.buildType(library, null);
   }
 }