Revert "Constructors for IDBKeyRange"

lib/dom/src/native_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.
 
 // These factory providers are for interfaces that do not have factory providers
 // generated automatically from a Constructor or NamedConstructor extended
 // attribute.
 
 class _AudioContextFactoryProvider {
   factory AudioContext() => FactoryProviderImplementation.createAudioContext();
@@ skipping 41 matching lines @@
       => FactoryProviderImplementation.U32(buffer, byteOffset, length);
 }
 
 class _WebKitPointFactoryProvider {
   factory WebKitPoint(num x, num y) => FactoryProviderImplementation.createWebKitPoint(x, y);
 }
 
 class _WebSocketFactoryProvider {
   factory WebSocket(String url) => FactoryProviderImplementation.createWebSocket(url);
 }
-
-class _IDBKeyRangeFactoryProvider {
-
-  factory IDBKeyRange.only(/*IDBKey*/ value) =>
-      FactoryProviderImplementation.IDBKeyRange_only(value);
-
-  factory IDBKeyRange.lowerBound(/*IDBKey*/ bound, [bool open = false]) =>
-      FactoryProviderImplementation.IDBKeyRange_lowerBound(bound, open);
-
-  factory IDBKeyRange.upperBound(/*IDBKey*/ bound, [bool open = false]) =>
-      FactoryProviderImplementation.IDBKeyRange_upperBound(bound, open);
-
-  factory IDBKeyRange.bound(/*IDBKey*/ lower, /*IDBKey*/ upper,
-                            [bool lowerOpen = false, bool upperOpen = false]) =>
-      FactoryProviderImplementation.IDBKeyRange_bound(lower, upper,
-                                                      lowerOpen, upperOpen);
-}