Remove Compiler access from ResolutionEnqueuer

pkg/compiler/lib/src/types/type_mask.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of masks;
 
 /// An implementation of a [UniverseSelectorConstraints] that is consists if an only
 /// increasing set of [TypeMask]s, that is, once a mask is added it cannot be
 /// removed.
 class IncreasingTypeMaskSet extends UniverseSelectorConstraints {
@@ skipping 338 matching lines @@
    * invoked on this type mask. [selector] is used to ensure library
    * privacy is taken into account.
    */
   bool canHit(Element element, Selector selector, ClosedWorld closedWorld);
 
   /**
    * Returns the [element] that is known to always be hit at runtime
    * on this mask. Returns null if there is none.
    */
   // TODO(johnniwinther): Move this method to [World].
-  Element locateSingleElement(Selector selector, Compiler compiler);
+  Element locateSingleElement(Selector selector, ClosedWorld closedWorld);
 }