Revert "Constructors for IDBKeyRange"

lib/dom/src/dummy_FactoryProviders.dart

 // Copyright (c) 2012, 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.
 
 
 _dummy() {
   throw const NotImplementedException();
 }
 
 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();
   factory Float32Array.fromList(List<num> list) => _dummy();
   factory Float32Array.fromBuffer(ArrayBuffer buffer) => _dummy();
 
   factory Float64Array(int length) => _dummy();
   factory Float64Array.fromList(List<num> list) => _dummy();
   factory Float64Array.fromBuffer(ArrayBuffer buffer) => _dummy();
 
@@ skipping 28 matching lines @@
 
 class _WebKitPointFactoryProvider {
 
   factory WebKitPoint(num x, num y) => _dummy();
 }
 
 class _WebSocketFactoryProvider {
 
   factory WebSocket(String url) => _dummy();
 }