Add webgl constants back to correct class

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 ec2657aa32ebbf37bbb3fd47be954523de7f5c94..edb3411e1cf4540588ed03d8bfa4f7ed0ba0d363 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -30154,12 +30154,12 @@ class Url extends NativeFieldWrapperClass2 implements UrlUtils {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _blink.BlinkURL.createObjectURL_Callback_Blob(blob_OR_source_OR_stream);
     }
-    if ((blob_OR_source_OR_stream is MediaStream)) {
-      return _blink.BlinkURL.createObjectURL_Callback_MediaStream(blob_OR_source_OR_stream);
-    }
     if ((blob_OR_source_OR_stream is MediaSource)) {
       return _blink.BlinkURL.createObjectURL_Callback_MediaSource(blob_OR_source_OR_stream);
     }
+    if ((blob_OR_source_OR_stream is MediaStream)) {
+      return _blink.BlinkURL.createObjectURL_Callback_MediaStream(blob_OR_source_OR_stream);
+    }
     throw new ArgumentError("Incorrect number or type of arguments");
   }