focus() behaviour differs depending on how value is set

Source/core/html/HTMLTextFormControlElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2009, 2010, 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 77 matching lines @@
 
 protected:
     HTMLTextFormControlElement(const QualifiedName&, Document&, HTMLFormElement*);
     bool isPlaceholderEmpty() const;
     virtual void updatePlaceholderText() = 0;
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     void cacheSelection(int start, int end, TextFieldSelectionDirection direction)
     {
+        ASSERT(start >= 0);
         m_cachedSelectionStart = start;
         m_cachedSelectionEnd = end;
         m_cachedSelectionDirection = direction;
     }
 
     void restoreCachedSelection();
-    bool hasCachedSelection() const { return m_cachedSelectionStart >= 0; }
 
     virtual void defaultEventHandler(Event*) OVERRIDE;
     virtual void subtreeHasChanged() = 0;
 
     void setLastChangeWasNotUserEdit() { m_lastChangeWasUserEdit = false; }
 
     String valueWithHardLineBreaks() const;
 
 private:
     int computeSelectionStart() const;
@@ skipping 25 matching lines @@
     return element.isTextFormControl();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLTextFormControlElement);
 
 HTMLTextFormControlElement* enclosingTextFormControl(const Position&);
 
 } // namespace
 
 #endif