AX: remove unused AXObject::selectedText.

Source/core/html/HTMLTextFormControlElement.cpp

Index: Source/core/html/HTMLTextFormControlElement.cpp
diff --git a/Source/core/html/HTMLTextFormControlElement.cpp b/Source/core/html/HTMLTextFormControlElement.cpp
index 47ccffe82571ab80dbc43f21e420f9ca05025b46..11bcdf648014e6c5354c5c025fcd54db5840632e 100644
--- a/Source/core/html/HTMLTextFormControlElement.cpp
+++ b/Source/core/html/HTMLTextFormControlElement.cpp
@@ -182,13 +182,6 @@ void HTMLTextFormControlElement::select()
     setSelectionRange(0, numeric_limits<int>::max(), SelectionHasNoDirection);
 }
 
-String HTMLTextFormControlElement::selectedText() const
-{
-    if (!isTextFormControl())
-        return String();
-    return value().substring(selectionStart(), selectionEnd() - selectionStart());
-}
-
 void HTMLTextFormControlElement::dispatchFormControlChangeEvent()
 {
     if (m_textAsOfLastFormControlChangeEvent != value()) {