Revert "Make GlobalEventHandlers not inherit from EventTarget"

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 b8d2a216ccedd1f39e2a171857bd29601799bf26..0459d733d2848f53478669f1166ff5c9f2b76573 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -19105,7 +19105,7 @@ class Geoposition extends DartHtmlDomObject {
 @DocsEditable()
 @DomName('GlobalEventHandlers')
 @Experimental() // untriaged
-abstract class GlobalEventHandlers {
+abstract class GlobalEventHandlers extends EventTarget {
   // To suppress missing implicit constructor warnings.
   factory GlobalEventHandlers._() { throw new UnsupportedError("Not supported"); }
 
@@ -37614,10 +37614,10 @@ class Url extends DartHtmlDomObject implements UrlUtils {
     if ((blob_OR_source_OR_stream is Blob || blob_OR_source_OR_stream == null)) {
       return _blink.BlinkURL.instance.createObjectURL_Callback_1_(unwrap_jso(blob_OR_source_OR_stream));
     }
-    if ((blob_OR_source_OR_stream is MediaSource)) {
+    if ((blob_OR_source_OR_stream is MediaStream)) {
       return _blink.BlinkURL.instance.createObjectURL_Callback_1_(unwrap_jso(blob_OR_source_OR_stream));
     }
-    if ((blob_OR_source_OR_stream is MediaStream)) {
+    if ((blob_OR_source_OR_stream is MediaSource)) {
       return _blink.BlinkURL.instance.createObjectURL_Callback_1_(unwrap_jso(blob_OR_source_OR_stream));
     }
     throw new ArgumentError("Incorrect number or type of arguments");