Add text field change handling for autofill preview in textarea element.

Source/web/WebInputElement.cpp

Index: Source/web/WebInputElement.cpp
diff --git a/Source/web/WebInputElement.cpp b/Source/web/WebInputElement.cpp
index c8e145efba5ba9af8aa799302ac8ee3c00a9d4d3..1c2aac8bfaa056091aa5b6e84a5729d00d0cb3ca 100644
--- a/Source/web/WebInputElement.cpp
+++ b/Source/web/WebInputElement.cpp
@@ -112,11 +112,6 @@ WebString WebInputElement::value() const
     return constUnwrap<HTMLInputElement>()->value();
 }
 
-WebString WebInputElement::editingValue() const
-{
-    return constUnwrap<HTMLInputElement>()->innerTextValue();
-}
-
 void WebInputElement::setEditingValue(const WebString& value)
 {
     unwrap<HTMLInputElement>()->setEditingValue(value);
@@ -137,16 +132,6 @@ void WebInputElement::setSelectionRange(int start, int end)
     unwrap<HTMLInputElement>()->setSelectionRange(start, end);
 }
 
-int WebInputElement::selectionStart() const
-{
-    return constUnwrap<HTMLInputElement>()->selectionStart();
-}
-
-int WebInputElement::selectionEnd() const
-{
-    return constUnwrap<HTMLInputElement>()->selectionEnd();
-}
-
 bool WebInputElement::isValidValue(const WebString& value) const
 {
     return constUnwrap<HTMLInputElement>()->isValidValue(value);