Remove mask parameter from TypeMask.locateSingleElement

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

Index: pkg/compiler/lib/src/types/type_mask.dart
diff --git a/pkg/compiler/lib/src/types/type_mask.dart b/pkg/compiler/lib/src/types/type_mask.dart
index 698d87ec698893a5a205eee8d0c2a7a8f18b8429..d14bd95e754ccefc69947c7e02ee5b82ff45a59a 100644
--- a/pkg/compiler/lib/src/types/type_mask.dart
+++ b/pkg/compiler/lib/src/types/type_mask.dart
@@ -358,6 +358,5 @@ abstract class TypeMask implements ReceiverConstraint, AbstractValue {
    * on this mask. Returns null if there is none.
    */
   // TODO(johnniwinther): Move this method to [World].
-  Element locateSingleElement(
-      Selector selector, TypeMask mask, Compiler compiler);
+  Element locateSingleElement(Selector selector, Compiler compiler);
 }