pkg: analysis aided cleanup

pkg/unmodifiable_collection/test/unmodifiable_collection_test.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.
 
 import "package:unmodifiable_collection/unmodifiable_collection.dart";
 import "package:unittest/unittest.dart";
 
 // Test unmodifiable collection views.
 // The collections should pass through the operations that are allowed,
 // an throw on the ones that aren't without affecting the original.
@@ skipping 425 matching lines @@
 
   testThrows("$name - removeAt throws", () {
     wrapped.removeAt(0);
   });
 
   testThrows("$name - removeLast throws", () {
     wrapped.removeLast();
   });
 
   testThrows("$name - removeWhere throws", () {
-    wrapped.removeWhere((E element) => false);
+    wrapped.removeWhere((element) => false);
   });
 
   testThrows("$name - retainWhere throws", () {
-    wrapped.retainWhere((E element) => true);
+    wrapped.retainWhere((element) => true);
   });
 
   testThrows("$name - removeRange throws", () {
     wrapped.removeRange(0, wrapped.length);
   });
 
   testThrows("$name - replaceRange throws", () {
     wrapped.replaceRange(0, wrapped.length, [42]);
   });
 
@@ skipping 159 matching lines @@
  });
 
  testThrows("$name remove throws", () {
    wrapped.remove(0);
  });
 
  testThrows("$name clear throws", () {
    wrapped.clear();
  });
 }