Use event target doc as getActiveElement context

Depends on facebook/fbjs#188

Author: acusti

src/renderers/dom/shared/eventPlugins/SelectEventPlugin.js

@@ -107,9 +107,10 @@ function constructSelectEvent(nativeEvent, nativeEventTarget) {
   // selection (this matches native `select` event behavior). In HTML5, select
   // fires only on input and textarea thus if there's no focused element we
   // won't dispatch.
+  var doc = nativeEventTarget.ownerDocument || nativeEventTarget.document || nativeEventTarget;
   if (mouseDown ||
       activeElement == null ||
-      activeElement !== getActiveElement()) {
+      activeElement !== getActiveElement(doc)) {
     return null;
   }