Dart2js deferred loading. Follow types of functions when calculating dependencies.

pkg/compiler/lib/src/typechecker.dart

Index: pkg/compiler/lib/src/typechecker.dart
diff --git a/pkg/compiler/lib/src/typechecker.dart b/pkg/compiler/lib/src/typechecker.dart
index 078086c823def58beca12c5ff43afed21d522686..c126bd237deba192ee612929b857b15d0eba502e 100644
--- a/pkg/compiler/lib/src/typechecker.dart
+++ b/pkg/compiler/lib/src/typechecker.dart
@@ -912,18 +912,18 @@ class TypeCheckerVisitor extends Visitor<DartType> {
       if (error) {
         // TODO(johnniwinther): Improve access to declaring element and handle
         // synthesized member signatures. Currently function typed instance
-        // members provide no access to there own name.
+        // members provide no access to their own name.
         if (element == null) {
           element = type.element;
-        } else if (type.element.isTypedef) {
-          if (element != null) {
-            reportTypeInfo(element,
-                           MessageKind.THIS_IS_THE_DECLARATION,
-                           {'name': element.name});
-          }
+        } else if (type.isTypedef) {
+          reportTypeInfo(element,
+              MessageKind.THIS_IS_THE_DECLARATION,
+              {'name': element.name});
           element = type.element;
         }
-        reportTypeInfo(element, MessageKind.THIS_IS_THE_METHOD);
+        if (element != null) {
+          reportTypeInfo(element, MessageKind.THIS_IS_THE_METHOD);
+        }
       }
     } else {
       while(!arguments.isEmpty) {