Remove more dead code from accessibility/ folder

Source/core/accessibility/AXListBox.cpp

Index: Source/core/accessibility/AXListBox.cpp
diff --git a/Source/core/accessibility/AXListBox.cpp b/Source/core/accessibility/AXListBox.cpp
index 7037d33910afbe8e558e617f45eb8d23f1c9bd19..6ac49d143c80f01f4c0e26a98d18c2ba9ad7ba90 100644
--- a/Source/core/accessibility/AXListBox.cpp
+++ b/Source/core/accessibility/AXListBox.cpp
@@ -53,15 +53,6 @@ PassRefPtr<AXListBox> AXListBox::create(RenderObject* renderer)
     return adoptRef(new AXListBox(renderer));
 }
 
-bool AXListBox::canSetSelectedChildrenAttribute() const
-{
-    Node* selectNode = m_renderer->node();
-    if (!selectNode)
-        return false;
-
-    return !toHTMLSelectElement(selectNode)->isDisabledFormControl();
-}
-
 void AXListBox::addChildren()
 {
     Node* selectNode = m_renderer->node();
@@ -81,47 +72,6 @@ void AXListBox::addChildren()
     }
 }
 
-void AXListBox::setSelectedChildren(AccessibilityChildrenVector& children)
-{
-    if (!canSetSelectedChildrenAttribute())
-        return;
-
-    Node* selectNode = m_renderer->node();
-    if (!selectNode)
-        return;
-
-    // disable any selected options
-    unsigned length = m_children.size();
-    for (unsigned i = 0; i < length; i++) {
-        AXListBoxOption* listBoxOption = toAXListBoxOption(m_children[i].get());
-        if (listBoxOption->isSelected())
-            listBoxOption->setSelected(false);
-    }
-
-    length = children.size();
-    for (unsigned i = 0; i < length; i++) {
-        AXObject* obj = children[i].get();
-        if (obj->roleValue() != ListBoxOptionRole)
-            continue;
-
-        toAXListBoxOption(obj)->setSelected(true);
-    }
-}
-
-void AXListBox::selectedChildren(AccessibilityChildrenVector& result)
-{
-    ASSERT(result.isEmpty());
-
-    if (!hasChildren())
-        addChildren();
-
-    unsigned length = m_children.size();
-    for (unsigned i = 0; i < length; i++) {
-        if (toAXListBoxOption(m_children[i].get())->isSelected())
-            result.append(m_children[i]);
-    }
-}
-
 AXObject* AXListBox::listBoxOptionAXObject(HTMLElement* element) const
 {
     // skip hr elements