Restore workaround for old Chrome bug that also affects Safari and in some cases Firefox, fix test …

sdk/lib/html/dart2js/html_dart2js.dart

Index: sdk/lib/html/dart2js/html_dart2js.dart
diff --git a/sdk/lib/html/dart2js/html_dart2js.dart b/sdk/lib/html/dart2js/html_dart2js.dart
index 4cc90adf80c4289040b1e2ac95d471843299d79c..0f15bdc72da26e478431c5f3d4952544ce9a94b9 100644
--- a/sdk/lib/html/dart2js/html_dart2js.dart
+++ b/sdk/lib/html/dart2js/html_dart2js.dart
@@ -13181,6 +13181,12 @@ abstract class Element extends Node implements GlobalEventHandlers, ParentNode,
     if (_parseDocument == null) {
       _parseDocument = document.implementation.createHtmlDocument('');
       _parseRange = _parseDocument.createRange();
+	
+      // Workaround for Safari bug. Was also previously Chrome bug 229142
+      // - URIs are not resolved in new doc.	
+      var base = _parseDocument.createElement('base');	
+      base.href = document.baseUri;	
+      _parseDocument.head.append(base);
     }
     var contextElement;
     if (this is BodyElement) {