Revert "Improve support for :read-only and :read-write pseudoclasses."

Source/core/html/HTMLElement.cpp

Index: Source/core/html/HTMLElement.cpp
diff --git a/Source/core/html/HTMLElement.cpp b/Source/core/html/HTMLElement.cpp
index 57cd08514ec9b1a293ebb29528433b9bfd21a2e2..d1de67857906b24273d2485af849517d386a1ad6 100644
--- a/Source/core/html/HTMLElement.cpp
+++ b/Source/core/html/HTMLElement.cpp
@@ -921,25 +921,6 @@ void HTMLElement::defaultEventHandler(Event* event)
     Element::defaultEventHandler(event);
 }
 
-bool HTMLElement::matchesReadOnlyPseudoClass() const
-{
-    return !matchesReadWritePseudoClass();
-}
-
-bool HTMLElement::matchesReadWritePseudoClass() const
-{
-    const AtomicString& value = fastGetAttribute(contenteditableAttr);
-    if (!value.isNull()) {
-        if (value.isEmpty() || equalIgnoringCase(value, "true") || equalIgnoringCase(value, "plaintext-only"))
-            return true;
-        if (equalIgnoringCase(value, "false"))
-            return false;
-        // All other values should be treated as "inherit".
-    }
-
-    return parentElement() && parentElement()->rendererIsEditable();
-}
-
 void HTMLElement::handleKeypressEvent(KeyboardEvent* event)
 {
     if (!document().settings() || !document().settings()->spatialNavigationEnabled() || !supportsFocus())