Ensure locations are always provided, but don't store them yet.

pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart

Index: pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart b/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
index 47c88901aa8498c6877000fcbf61af6c5ca9cea4..32675f3acb6071e42131b9beab319e2e7dc74717 100644
--- a/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
+++ b/pkg/front_end/lib/src/fasta/builder/dynamic_type_builder.dart
@@ -5,16 +5,16 @@
 library fasta.dynamic_type_builder;
 
 import 'builder.dart' show
+    LibraryBuilder,
     TypeBuilder,
     TypeDeclarationBuilder;
 
-// TODO(ahe): Make const class.
 class DynamicTypeBuilder<T extends TypeBuilder, R>
     extends TypeDeclarationBuilder<T, R> {
   final R type;
 
-  DynamicTypeBuilder(this.type)
-      : super (null, 0, "dynamic", null, null);
+  DynamicTypeBuilder(this.type, LibraryBuilder compilationUnit, int charOffset)
+      : super(null, 0, "dynamic", null, compilationUnit, charOffset);
 
   R buildType(List<T> arguments) => type;