Reduce use of elements/resolution_types in enqueuer.

tests/compiler/dart2js/resolver_test.dart

Index: tests/compiler/dart2js/resolver_test.dart
diff --git a/tests/compiler/dart2js/resolver_test.dart b/tests/compiler/dart2js/resolver_test.dart
index 7d122ed2641002b2a0972b372a6d21fcf967adf8..e461da535559932c79b1e8e3e51ea2750c8b46b5 100644
--- a/tests/compiler/dart2js/resolver_test.dart
+++ b/tests/compiler/dart2js/resolver_test.dart
@@ -1150,9 +1150,9 @@ Future compileScript(String source) {
 
 checkMemberResolved(compiler, className, memberName) {
   ClassElement cls = findElement(compiler, className);
-  Element memberElement = cls.lookupLocalMember(memberName);
+  MemberElement memberElement = cls.lookupLocalMember(memberName);
   Expect.isNotNull(memberElement);
-  Expect.isTrue(compiler.enqueuer.resolution.hasBeenProcessed(memberElement));
+  Expect.isTrue(compiler.resolutionWorldBuilder.isMemberUsed(memberElement));
 }
 
 testToString() {