Add a constructor for DOMParser.

client/dom/frog/dom_frog.dart

Index: client/dom/frog/dom_frog.dart
diff --git a/client/dom/frog/dom_frog.dart b/client/dom/frog/dom_frog.dart
index bb9e357cbeb1a2509d38a61cf70d890bba321724..15ea4d9f5edabbc70c8905ea4ceb836da528b6b3 100644
--- a/client/dom/frog/dom_frog.dart
+++ b/client/dom/frog/dom_frog.dart
@@ -1159,6 +1159,7 @@ class _DOMMimeTypeArrayJs extends _DOMTypeJs implements DOMMimeTypeArray native
 }
 
 class _DOMParserJs extends _DOMTypeJs implements DOMParser native "*DOMParser" {
+  DOMParser() native;
 
   _DocumentJs parseFromString(String str, String contentType) native;
 }
@@ -14413,7 +14414,9 @@ interface DOMMimeTypeArray {
 
 // WARNING: Do not edit - generated code.
 
-interface DOMParser {
+interface DOMParser default _DOMParserFactoryProvider {
+
+  DOMParser();
 
   Document parseFromString(String str, String contentType);
 }
@@ -26692,6 +26695,10 @@ class _AudioContextFactoryProvider {
 ''';
 }
 
+class _DOMParserFactoryProvider {
+  factory DOMParser() native '''return new DOMParser();''';
+}
+
 class _FileReaderFactoryProvider {
 
   factory FileReader() native '''return new FileReader();''';