Select elements should clear type-ahead session on blur.

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 1034 matching lines @@
 {
     // Save the selection so it can be compared to the new selection when
     // dispatching change events during blur event dispatch.
     if (usesMenuList())
         saveLastSelection();
     HTMLFormControlElementWithState::dispatchFocusEvent(oldFocusedElement, type, sourceCapabilities);
 }
 
 void HTMLSelectElement::dispatchBlurEvent(Element* newFocusedElement, WebFocusType type, InputDeviceCapabilities* sourceCapabilities)
 {
+    m_typeAhead.resetSession();
     // We only need to fire change events here for menu lists, because we fire
     // change events for list boxes whenever the selection change is actually made.
     // This matches other browsers' behavior.
     if (usesMenuList())
         dispatchInputAndChangeEventForMenuList();
     HTMLFormControlElementWithState::dispatchBlurEvent(newFocusedElement, type, sourceCapabilities);
 }
 
 void HTMLSelectElement::deselectItemsWithoutValidation(HTMLElement* excludeElement)
 {
@@ skipping 879 matching lines @@
 
 void HTMLSelectElement::detach(const AttachContext& context)
 {
     HTMLFormControlElementWithState::detach(context);
     if (m_popup)
         m_popup->disconnectClient();
     m_popupIsVisible = false;
     m_popup = nullptr;
 }
 
+void HTMLSelectElement::resetTypeAheadSessionForTesting()
+{
+    m_typeAhead.resetSession();
+}
+
 } // namespace blink