Undeprecate buildCompileTimeError.

pkg/front_end/lib/src/fasta/source/source_loader.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.source_loader;
 
 import 'dart:async' show Future;
 
 import 'dart:typed_data' show Uint8List;
 
@@ skipping 14 matching lines @@
     show
         Builder,
         ClassBuilder,
         EnumBuilder,
         LibraryBuilder,
         NamedTypeBuilder,
         TypeBuilder;
 
 import '../compiler_context.dart' show CompilerContext;
 
-import '../deprecated_problems.dart' show deprecated_inputError;
+import '../deprecated_problems.dart'
+    show deprecated_formatUnexpected, deprecated_inputError;
 
 import '../export.dart' show Export;
 
 import '../fasta_codes.dart'
     show
+        Message,
         templateCyclicClassHierarchy,
         templateExtendingEnum,
         templateExtendingRestricted,
         templateIllegalMixin,
         templateIllegalMixinDueToConstructors,
         templateIllegalMixinDueToConstructorsCause,
         templateUnspecified;
 
 import '../kernel/kernel_shadow_ast.dart' show KernelTypeInferenceEngine;
 
@@ skipping 15 matching lines @@
 
 import 'source_class_builder.dart' show SourceClassBuilder;
 
 import 'source_library_builder.dart' show SourceLibraryBuilder;
 
 class SourceLoader<L> extends Loader<L> {
   /// The [FileSystem] which should be used to access files.
   final FileSystem fileSystem;
 
   final Map<Uri, List<int>> sourceBytes = <Uri, List<int>>{};
+
   final bool excludeSource = CompilerContext.current.options.excludeSource;
 
   // Used when building directly to kernel.
   ClassHierarchy hierarchy;
   CoreTypes coreTypes;
 
   TypeInferenceEngine typeInferenceEngine;
 
   Instrumentation instrumentation;
 
@@ skipping 433 matching lines @@
         isSuper: isSuper,
         isStatic: isStatic,
         isConstructor: isConstructor,
         isTopLevel: isTopLevel);
   }
 
   Expression throwCompileConstantError(Expression error) {
     return target.backendTarget.throwCompileConstantError(coreTypes, error);
   }
 
-  Expression deprecated_buildCompileTimeError(String message, int offset) {
-    return target.backendTarget
-        .buildCompileTimeError(coreTypes, message, offset);
+  Expression buildCompileTimeError(Message message, int offset, Uri uri) {
+    String text = deprecated_formatUnexpected(uri, offset, message.message);
+    return target.backendTarget.buildCompileTimeError(coreTypes, text, offset);
   }
 }