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

Source/modules/accessibility/AXRenderObject.cpp

Index: Source/modules/accessibility/AXRenderObject.cpp
diff --git a/Source/modules/accessibility/AXRenderObject.cpp b/Source/modules/accessibility/AXRenderObject.cpp
index f1dc520191ea7e2feb2bf192947c4e6a5c5fe243..1e241c296fcfb84ebc2ddae3b3b0583d19ae7a71 100644
--- a/Source/modules/accessibility/AXRenderObject.cpp
+++ b/Source/modules/accessibility/AXRenderObject.cpp
@@ -2211,7 +2211,7 @@ void AXRenderObject::addTextFieldChildren()
         return;
 
     HTMLInputElement& input = toHTMLInputElement(*node);
-    Element* spinButtonElement = input.userAgentShadowRoot()->getElementById(ShadowElementNames::spinButton());
+    Element* spinButtonElement = input.closedShadowRoot()->getElementById(ShadowElementNames::spinButton());
     if (!spinButtonElement || !spinButtonElement->isSpinButtonElement())
         return;