Make it possible to focus on 0-size form controls and anchors.

Source/core/html/HTMLFormControlElement.cpp

 /*
  * 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 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * 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 295 matching lines @@
     // trigger synchronous layout, so it must not be called during style recalc.
     if (renderer())
         queuePostAttachCallback(updateFromElementCallback, this);
 }
 
 bool HTMLFormControlElement::supportsFocus() const
 {
     return !isDisabledFormControl();
 }
 
-bool HTMLFormControlElement::rendererIsFocusable() const
-{
-    // If there's a renderer, make sure the size isn't empty, but if there's no renderer,
-    // it might still be focusable if it's in a canvas subtree (handled in Element::rendererIsFocusable).
-    if (renderer() && (!renderer()->isBox() || toRenderBox(renderer())->size().isEmpty()))
-        return false;
-    return HTMLElement::rendererIsFocusable();
-}
-
 bool HTMLFormControlElement::isKeyboardFocusable() const
 {
     // Skip tabIndex check in a parent class.
     return isFocusable();
 }
 
 bool HTMLFormControlElement::shouldShowFocusRingOnMouseFocus() const
 {
     return false;
 }
@@ skipping 160 matching lines @@
 HTMLFormControlElement* HTMLFormControlElement::enclosingFormControlElement(Node* node)
 {
     for (; node; node = node->parentNode()) {
         if (node->isElementNode() && toElement(node)->isFormControlElement())
             return toHTMLFormControlElement(node);
     }
     return 0;
 }
 
 } // namespace Webcore