Rename didEnterDocument and didLeaveDocument

Source/core/dom/custom/CustomElement.cpp

Index: Source/core/dom/custom/CustomElement.cpp
diff --git a/Source/core/dom/custom/CustomElement.cpp b/Source/core/dom/custom/CustomElement.cpp
index a3219fac1d8c92f4c9060ea8c1e3e70598578dbe..9e543df00d70ff8b1be3ddcfc720cd0cc422b4ae 100644
--- a/Source/core/dom/custom/CustomElement.cpp
+++ b/Source/core/dom/custom/CustomElement.cpp
@@ -115,7 +115,7 @@ void CustomElement::attributeDidChange(Element* element, const AtomicString& nam
     CustomElementScheduler::scheduleAttributeChangedCallback(element->customElementDefinition()->callbacks(), element, name, oldValue, newValue);
 }
 
-void CustomElement::didEnterDocument(Element* element, const Document& document)
+void CustomElement::didAttach(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     if (!document.domWindow())
@@ -123,7 +123,7 @@ void CustomElement::didEnterDocument(Element* element, const Document& document)
     CustomElementScheduler::scheduleCallback(element->customElementDefinition()->callbacks(), element, CustomElementLifecycleCallbacks::AttachedCallback);
 }
 
-void CustomElement::didLeaveDocument(Element* element, const Document& document)
+void CustomElement::didDetach(Element* element, const Document& document)
 {
     ASSERT(element->customElementState() == Element::Upgraded);
     if (!document.domWindow())