[cros,login] Hides dropdown menu on activation.

chrome/browser/resources/chromeos/login/network_dropdown.js

Index: chrome/browser/resources/chromeos/login/network_dropdown.js
diff --git a/chrome/browser/resources/chromeos/login/network_dropdown.js b/chrome/browser/resources/chromeos/login/network_dropdown.js
index 062a7cdcaf2d2919c3787a7cc36b7e2b75bd5fe1..cb058731f94f89d0020d0b26f842ad8df161f2bd 100644
--- a/chrome/browser/resources/chromeos/login/network_dropdown.js
+++ b/chrome/browser/resources/chromeos/login/network_dropdown.js
@@ -88,7 +88,6 @@ cr.define('cr.ui', function() {
       this.appendChild(this.title_ = this.createTitle_());
       this.appendChild(new DropDownContainer());
 
-      this.isShown = false;
       this.addEventListener('keydown', this.keyDownHandler_);
 
       this.title_.id = this.id + '-dropdown';
@@ -379,6 +378,7 @@ cr.define('cr.ui', function() {
   DropDown.setActive = function(elementId, isActive) {
     if (isActive) {
       DropDown.activeElementId_ = elementId;
+      $(elementId).isShown = false;
       chrome.send('networkDropdownShow', [elementId]);
     } else {
       if (DropDown.activeElementId_ == elementId) {