SELECT element: Ignore synthetic events.

third_party/WebKit/Source/core/html/HTMLSelectElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
@@ skipping 1288 matching lines @@
 {
     LayoutTheme& layoutTheme = LayoutTheme::theme();
     int keyCode = event->keyCode();
 
     return ((layoutTheme.popsMenuBySpaceKey() && event->keyCode() == ' ' && !m_typeAhead.hasActiveSession(event))
         || (layoutTheme.popsMenuByReturnKey() && keyCode == '\r'));
 }
 
 void HTMLSelectElement::menuListDefaultEventHandler(Event* event)
 {
+    // TODO(tkent): Remove isTrusted check when we ship
+    // TrustedEventsDefaultAction.
+    if (!event->isTrusted())
+        return;
     if (event->type() == EventTypeNames::keydown) {
         if (!layoutObject() || !event->isKeyboardEvent())
             return;
 
         KeyboardEvent* keyEvent = toKeyboardEvent(event);
         if (shouldOpenPopupForKeyDownEvent(keyEvent)) {
             handlePopupOpenKeyboardEvent(event);
             return;
         }
 
@@ skipping 664 matching lines @@
     m_popupIsVisible = false;
     m_popup = nullptr;
 }
 
 void HTMLSelectElement::resetTypeAheadSessionForTesting()
 {
     m_typeAhead.resetSession();
 }
 
 } // namespace blink