Rename {Author,UserAgent}ShadowRoot to {Open,Closed}ShadowRoot.

Source/core/html/HTMLSummaryElement.cpp

Index: Source/core/html/HTMLSummaryElement.cpp
diff --git a/Source/core/html/HTMLSummaryElement.cpp b/Source/core/html/HTMLSummaryElement.cpp
index d4dc503caeb8a4e7df23c6e73c41e95963f81626..9c34f70d41bb12ddb661a99c69ecb5f5b78a732c 100644
--- a/Source/core/html/HTMLSummaryElement.cpp
+++ b/Source/core/html/HTMLSummaryElement.cpp
@@ -39,7 +39,7 @@ using namespace HTMLNames;
 PassRefPtrWillBeRawPtr<HTMLSummaryElement> HTMLSummaryElement::create(Document& document)
 {
     RefPtrWillBeRawPtr<HTMLSummaryElement> summary = adoptRefWillBeNoop(new HTMLSummaryElement(document));
-    summary->ensureUserAgentShadowRoot();
+    summary->ensureClosedShadowRoot();
     return summary.release();
 }
 
@@ -53,7 +53,7 @@ LayoutObject* HTMLSummaryElement::createRenderer(const LayoutStyle&)
     return new RenderBlockFlow(this);
 }
 
-void HTMLSummaryElement::didAddUserAgentShadowRoot(ShadowRoot& root)
+void HTMLSummaryElement::didAddClosedShadowRoot(ShadowRoot& root)
 {
     RefPtrWillBeRawPtr<DetailsMarkerControl> markerControl = DetailsMarkerControl::create(document());
     markerControl->setIdAttribute(ShadowElementNames::detailsMarker());
@@ -71,7 +71,7 @@ HTMLDetailsElement* HTMLSummaryElement::detailsElement() const
 
 Element* HTMLSummaryElement::markerControl()
 {
-    return ensureUserAgentShadowRoot().getElementById(ShadowElementNames::detailsMarker());
+    return ensureClosedShadowRoot().getElementById(ShadowElementNames::detailsMarker());
 }
 
 bool HTMLSummaryElement::isMainSummary() const