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

Source/core/html/HTMLProgressElement.h

Index: Source/core/html/HTMLProgressElement.h
diff --git a/Source/core/html/HTMLProgressElement.h b/Source/core/html/HTMLProgressElement.h
index 916983fc7e3b83c33a5801fc244a8fd1b2af1e65..922bbea6403c30259de03f47c87e7e23988cad58 100644
--- a/Source/core/html/HTMLProgressElement.h
+++ b/Source/core/html/HTMLProgressElement.h
@@ -53,7 +53,7 @@ private:
     virtual ~HTMLProgressElement();
 
     virtual bool areAuthorShadowsAllowed() const override { return false; }
-    virtual void willAddFirstAuthorShadowRoot() override;
+    virtual void willAddFirstOpenShadowRoot() override;
     virtual bool shouldAppearIndeterminate() const override;
     virtual bool supportLabels() const override { return true; }
 
@@ -65,7 +65,7 @@ private:
     virtual void attach(const AttachContext& = AttachContext()) override;
 
     void didElementStateChange();
-    virtual void didAddUserAgentShadowRoot(ShadowRoot&) override;
+    virtual void didAddClosedShadowRoot(ShadowRoot&) override;
     bool isDeterminate() const;
 
     RawPtrWillBeMember<ProgressValueElement> m_value;