Re-generate html library.

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 f7c00d41f650a3f6c4ef1a59466c0bf439e46831..5ac7b16bc623997de4009c8d6e4985eea82abacd 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -12214,21 +12214,20 @@ class Geolocation extends NativeFieldWrapperClass1 {
     int watchId;
     var controller;
     controller = new StreamController<Geoposition>(
-      onSubscriptionStateChange: () {
-        if (controller.hasListener) {
-          assert(watchId == null);
-          watchId = $dom_watchPosition(
-              (position) {
-                controller.add(_ensurePosition(position));
-              },
-              (error) {
-                controller.addError(error);
-              },
-              options);
-        } else {
-          assert(watchId != null);
-          $dom_clearWatch(watchId);
-        }
+      onListen: () {
+        assert(watchId == null);
+        watchId = $dom_watchPosition(
+            (position) {
+              controller.add(_ensurePosition(position));
+            },
+            (error) {
+              controller.addError(error);
+            },
+            options);
+      },
+      onCancel: () {
+        assert(watchId != null);
+        $dom_clearWatch(watchId);
       });
 
     return controller.stream;