Remove return in visitInitializers.

pkg/compiler/lib/src/resolution/semantic_visitor.dart

Index: pkg/compiler/lib/src/resolution/semantic_visitor.dart
diff --git a/pkg/compiler/lib/src/resolution/semantic_visitor.dart b/pkg/compiler/lib/src/resolution/semantic_visitor.dart
index 2449cae569265c41bf7ada7b79c36e94c3a95575..854c1bd25f631284b7de7b346944477a856aa9ee 100644
--- a/pkg/compiler/lib/src/resolution/semantic_visitor.dart
+++ b/pkg/compiler/lib/src/resolution/semantic_visitor.dart
@@ -96,9 +96,9 @@ abstract class SemanticDeclarationResolvedMixin<R, A>
       for (Node node in initializers) {
         InitializerStructure structure = computeInitializerStructure(node);
         if (structure == null) {
-          return internalError(node, 'No structure for $node');
+          internalError(node, 'No structure for $node');
         } else {
-          return structure.dispatch(declVisitor, node, arg);
+          structure.dispatch(declVisitor, node, arg);
         }
       }
     }