Revert "Revert "Revert "Constructors for IDBKeyRange"""

lib/dom/src/dummy_FactoryProviders.dart

Index: lib/dom/src/dummy_FactoryProviders.dart
diff --git a/lib/dom/src/dummy_FactoryProviders.dart b/lib/dom/src/dummy_FactoryProviders.dart
index 861b19a07b69e6d676664a297e5aad74d6b66db4..2a8a0cb98e45e1eb2a064c5f2a78be7186391697 100644
--- a/lib/dom/src/dummy_FactoryProviders.dart
+++ b/lib/dom/src/dummy_FactoryProviders.dart
@@ -12,15 +12,6 @@ class _AudioContextFactoryProvider {
   factory AudioContext() => _dummy();
 }
 
-class _IDBKeyRangeFactoryProvider {
-
-  factory IDBKeyRange.only(/*IDBKey*/ value) => _dummy();
-  factory IDBKeyRange.lowerBound(/*IDBKey*/ bound, [bool open]) => _dummy();
-  factory IDBKeyRange.upperBound(/*IDBKey*/ bound, [bool open]) => _dummy();
-  factory IDBKeyRange.bound(/*IDBKey*/ lower, /*IDBKey*/ upper,
-                            [bool lowerOpen, bool upperOpen]) => _dummy();
-}
-
 class _TypedArrayFactoryProvider {
 
   factory Float32Array(int length) => _dummy();