Deprecate all diagnostics methods that use strings.

pkg/front_end/lib/src/fasta/builder/constructor_reference_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.constructor_reference_builder;
 
 import 'builder.dart'
     show
         Builder,
         ClassBuilder,
         LibraryBuilder,
         PrefixBuilder,
         Scope,
         TypeBuilder;
 
-import '../messages.dart' show warning;
+import '../messages.dart' show deprecated_warning;
 
 class ConstructorReferenceBuilder extends Builder {
   final String name;
 
   final List<TypeBuilder> typeArguments;
 
   /// This is the name of a named constructor. As `bar` in `new Foo<T>.bar()`.
   final String suffix;
 
   Builder target;
@@ skipping 24 matching lines @@
           target = builder;
           return;
         }
       }
     }
     if (builder is ClassBuilder) {
       target = builder.findConstructorOrFactory(
           suffix ?? "", charOffset, fileUri, accessingLibrary);
     }
     if (target == null) {
-      warning(fileUri, charOffset,
+      deprecated_warning(fileUri, charOffset,
           "Couldn't find constructor '$fullNameForErrors'.");
     }
   }
 }