sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 6be6b162743b8741670976e2e33e37399df77d0f..3b44aeed3b32628302e4b621878fd94b0d11c46f 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -25885,13 +25885,13 @@ class Url extends NativeFieldWrapperClass1 {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_1(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_2(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is MediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_3(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream || blob_OR_source_OR_stream == null)) {
+    if ((blob_OR_source_OR_stream is _WebKitMediaSource || blob_OR_source_OR_stream == null)) {
       return _createObjectURL_4(blob_OR_source_OR_stream);
     }
     throw new ArgumentError("Incorrect number or type of arguments");
@@ -33294,7 +33294,8 @@ class _Utils {
     Symbol objectName = reflectClass(Object).qualifiedName;
     bool isRoot(ClassMirror cls) =>
       cls == null || cls.qualifiedName == objectName;
-    Symbol elementName = reflectClass(Element).qualifiedName;
+    // TODO(vsm): Support extending SvgElement as well.
+    Symbol elementName = reflectClass(HtmlElement).qualifiedName;
     bool isElement(ClassMirror cls) =>
       cls != null && cls.qualifiedName == elementName;
 
@@ -33303,7 +33304,7 @@ class _Utils {
     }
 
     if (isRoot(superClass)) {
-      throw new UnsupportedError("Invalid custom element doesn't inherit from Element.");
+      throw new UnsupportedError("Invalid custom element doesn't inherit from HtmlElement.");
     }
     _register(tag, type);
   }