Convert HashSet, LinkedHashSet to factory methods and custom implementations.

tests/corelib/set_test.dart

Index: tests/corelib/set_test.dart
diff --git a/tests/corelib/set_test.dart b/tests/corelib/set_test.dart
index f08583554288900e82cf9ffcfa4f0a2c947554ca..5b9763c7756c8aa255f9730eb1eb6083ebd3c79d 100644
--- a/tests/corelib/set_test.dart
+++ b/tests/corelib/set_test.dart
@@ -10,6 +10,7 @@ import "dart:collection";
 
 void testMain(Set create()) {
   Set set = create();
+
   testLength(0, set);
   set.add(1);
   testLength(1, set);
@@ -189,6 +190,15 @@ void testLength(int length, Set set) {
 }
 
 main() {
-  testMain(() => new Set());
   testMain(() => new HashSet());
+  testMain(() => new LinkedHashSet());
+  testMain(() => new HashSet(equals: identical));
+  testMain(() => new LinkedHashSet(equals: identical));
+  testMain(() => new HashSet(equals: (int a, int b) => a == b || a == -b,
+                             hashCode: (int n) => n.hashCode & (-n).hashCode,
+                             isValidKey: (n) => n is int));
+  testMain(() => new LinkedHashSet(
+      equals: (int a, int b) => a == b || a == -b,
+      hashCode: (int n) => n.hashCode & (-n).hashCode,
+      isValidKey: (n) => n is int));
 }