Remove mask parameter from TypeMask.locateSingleElement

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

Index: pkg/compiler/lib/src/types/forwarding_type_mask.dart
diff --git a/pkg/compiler/lib/src/types/forwarding_type_mask.dart b/pkg/compiler/lib/src/types/forwarding_type_mask.dart
index bc9ce155aee638bb0f8f82d49eb051f2313b1943..d886e9950291b37a88e6ccb4dcd3f834949a8507 100644
--- a/pkg/compiler/lib/src/types/forwarding_type_mask.dart
+++ b/pkg/compiler/lib/src/types/forwarding_type_mask.dart
@@ -101,9 +101,8 @@ abstract class ForwardingTypeMask implements TypeMask {
     return forwardTo.canHit(element, selector, classWorld);
   }
 
-  Element locateSingleElement(
-      Selector selector, TypeMask mask, Compiler compiler) {
-    return forwardTo.locateSingleElement(selector, mask, compiler);
+  Element locateSingleElement(Selector selector, Compiler compiler) {
+    return forwardTo.locateSingleElement(selector, compiler);
   }
 
   bool equalsDisregardNull(other) {