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

Source/core/html/forms/BaseButtonInputType.cpp

Index: Source/core/html/forms/BaseButtonInputType.cpp
diff --git a/Source/core/html/forms/BaseButtonInputType.cpp b/Source/core/html/forms/BaseButtonInputType.cpp
index cfec082b597610a4a5c7ccaf2b3f9243afabc638..c3aa5eb45c5703a6e27bfedd2a959059ace0b162 100644
--- a/Source/core/html/forms/BaseButtonInputType.cpp
+++ b/Source/core/html/forms/BaseButtonInputType.cpp
@@ -44,13 +44,13 @@ using namespace HTMLNames;
 
 void BaseButtonInputType::createShadowSubtree()
 {
-    ASSERT(element().userAgentShadowRoot());
-    element().userAgentShadowRoot()->appendChild(Text::create(element().document(), element().valueWithDefault()));
+    ASSERT(element().closedShadowRoot());
+    element().closedShadowRoot()->appendChild(Text::create(element().document(), element().valueWithDefault()));
 }
 
 void BaseButtonInputType::valueAttributeChanged()
 {
-    toText(element().userAgentShadowRoot()->firstChild())->setData(element().valueWithDefault());
+    toText(element().closedShadowRoot()->firstChild())->setData(element().valueWithDefault());
 }
 
 bool BaseButtonInputType::shouldSaveAndRestoreFormControlState() const