Remove ENTITY_REFERENCE_NODE

LayoutTests/fast/dom/EntityReference/script-tests/readonly-exceptions.js

-description("Test to make sure EntityReference nodes are always treated readonly")
-
-var xmlDoc = document.implementation.createDocument("http://www.w3.org/1999/xhtml", "html", null);
-var xmlDoc2 = document.implementation.createDocument("http://www.w3.org/1999/xhtml", "html", null);
-var entityReference = xmlDoc.createEntityReference("gt");
-
-shouldThrow("xmlDoc2.adoptNode(entityReference)");
-shouldBe("entityReference.ownerDocument", "xmlDoc")
-
-// nodeValue is defined to be null for Entity Reference nodes, and thus should silently fail to modify
-// Spec is ambigious as to if we should throw here or not.  I've requested clarification:
-// http://lists.w3.org/Archives/Public/www-dom/2008JanMar/0009.html
-shouldThrow("entityReference.nodeValue = 'foo'");
-shouldBe("entityReference.nodeValue", "null");
-
-shouldThrow("entityReference.prefix = 'foo'");
-shouldBe("entityReference.prefix", "null");
-
-shouldThrow("entityReference.textContent = 'foo'");
-shouldBe("entityReference.textContent", "'>'");
-
-var childrenBeforeFailedAppend = entityReference.childNodes.length;
-shouldBe("childrenBeforeFailedAppend", "1");
-var text = document.createTextNode("FAIL");
-shouldThrow("entityReference.appendChild(text)");
-shouldBe("entityReference.childNodes.length", "childrenBeforeFailedAppend");
-
-childrenBeforeFailedAppend = entityReference.childNodes.length;
-shouldBe("childrenBeforeFailedAppend", "1");
-shouldThrow("entityReference.insertBefore(text, entityReference.firstChild)");
-shouldBe("entityReference.childNodes.length", "childrenBeforeFailedAppend");