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

LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html

Index: LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html
diff --git a/LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html b/LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html
index c86777fe5d6df95cebb8126856978f88053ce76e..c4a79a65b176ce45508d88052419d56f34fd27dd 100644
--- a/LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html
+++ b/LayoutTests/fast/dom/shadow/drag-and-drop-in-user-agent-shadow.html
@@ -7,10 +7,10 @@ description('Tests whether we can not start dragging a node in user agent shadow
 
 sandbox.appendChild(
     createDOM('div', {'id': 'host', 'draggable': 'true'},
-              createUserAgentShadowRoot({},
-                                        createDOM('div', {'id': 'shadow-root-child'},
-                                                  document.createTextNode('Shadow Root Child')),
-                                        createDOM('content', {}))));
+              createClosedShadowRoot({},
+                                     createDOM('div', {'id': 'shadow-root-child'},
+                                               document.createTextNode('Shadow Root Child')),
+                                     createDOM('content', {}))));
 
 var shadowRootChild = window.internals.youngestShadowRoot(host).getElementById('shadow-root-child');
 var dragstartCount = 0;