Change IllegalArgumentException to ArgumentError.

lib/html/templates/html/dart2js/impl_IDBDatabase.darttemplate

 // 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.
 
 class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
   _IDBTransactionImpl transaction(storeName_OR_storeNames, String mode) {
     if (mode != 'readonly' && mode != 'readwrite') {
-      throw new IllegalArgumentException(mode);
+      throw new ArgumentError(mode);
     }
 
     // TODO(sra): Ensure storeName_OR_storeNames is a string, List<String> or
     // DOMStringList, and copy to JavaScript array if necessary.
 
     if (_transaction_fn != null) {
       return _transaction_fn(this, storeName_OR_storeNames, mode);
     }
 
     // Try and create a transaction with a string mode.  Browsers that expect a
@@ skipping 22 matching lines @@
 
   _IDBTransactionImpl _transaction(stores, mode) native 'transaction';
 
   static bool _hasNumericMode(txn) native 'return typeof(txn.mode) === "number"';
 
 $!MEMBERS}
 
 // TODO(sra): This should be a static member of _IDBTransactionImpl but dart2js
 // can't handle that.  Move it back after dart2js is completely done.
 var _transaction_fn;  // Assigned one of the static methods.