Further reduce use of Element in codegen.

pkg/compiler/lib/src/universe/selector.dart

Index: pkg/compiler/lib/src/universe/selector.dart
diff --git a/pkg/compiler/lib/src/universe/selector.dart b/pkg/compiler/lib/src/universe/selector.dart
index bc959c11af499b8b9abeacfc1c32c8f3fa72002f..8ca86371d752ae2fae4e3ac94b7b8ce246886b02 100644
--- a/pkg/compiler/lib/src/universe/selector.dart
+++ b/pkg/compiler/lib/src/universe/selector.dart
@@ -12,6 +12,7 @@ import '../elements/elements.dart'
         Elements,
         FunctionElement,
         FunctionSignature,
+        MemberElement,
         Name,
         LibraryElement,
         PublicName;
@@ -247,7 +248,7 @@ class Selector {
     return callStructure.signatureApplies(function.functionSignature);
   }
 
-  bool applies(Element element) {
+  bool applies(MemberElement element) {
     if (name != element.name) return false;
     return appliesUnnamed(element);
   }