Remove a lot of API surface from Element.

sky/engine/core/html/HTMLElement.cpp

Index: sky/engine/core/html/HTMLElement.cpp
diff --git a/sky/engine/core/html/HTMLElement.cpp b/sky/engine/core/html/HTMLElement.cpp
index 81da447a4205885fcdb273cb31fbcd529d251ac4..7d1775513da006ea98440275e2c44b8fc5418c39 100644
--- a/sky/engine/core/html/HTMLElement.cpp
+++ b/sky/engine/core/html/HTMLElement.cpp
@@ -135,26 +135,6 @@ bool HTMLElement::isInteractiveContent() const
     return false;
 }
 
-bool HTMLElement::matchesReadOnlyPseudoClass() const
-{
-    return !matchesReadWritePseudoClass();
-}
-
-bool HTMLElement::matchesReadWritePseudoClass() const
-{
-    if (hasAttribute(HTMLNames::contenteditableAttr)) {
-        const AtomicString& value = getAttribute(HTMLNames::contenteditableAttr);
-
-        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()->hasEditableStyle();
-}
-
 const AtomicString& HTMLElement::eventParameterName()
 {
     DEFINE_STATIC_LOCAL(const AtomicString, eventString, ("event", AtomicString::ConstructFromLiteral));