Select elements should clear type-ahead session on blur.

Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 287 matching lines @@
     String markerTextForListItem(Element*);
 
     void forceReload(bool endToEnd);
 
     String getImageSourceURL(Element*);
 
     String selectMenuListText(HTMLSelectElement*);
     bool isSelectPopupVisible(Node*);
     bool selectPopupItemStyleIsRtl(Node*, int);
     int selectPopupItemStyleFontHeight(Node*, int);
+    void resetTypeAheadSession(HTMLSelectElement*);
 
     ClientRect* selectionBounds(ExceptionState&);
 
     bool loseSharedGraphicsContext3D();
 
     void forceCompositingUpdate(Document*, ExceptionState&);
 
     void setZoomFactor(float);
 
     void setShouldRevealPassword(Element*, bool, ExceptionState&);
@@ skipping 67 matching lines @@
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     Member<InternalRuntimeFlags> m_runtimeFlags;
 
     IterationSource* startIteration(ScriptState*, ExceptionState&) override;
 };
 
 } // namespace blink
 
 #endif // Internals_h