Simplify PROGRESS shadow elements.

third_party/WebKit/Source/core/html/HTMLProgressElement.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef HTMLProgressElement_h
 #define HTMLProgressElement_h
 
 #include "core/CoreExport.h"
 #include "core/html/LabelableElement.h"
 
 namespace blink {
 
-class ProgressValueElement;
 class LayoutProgress;
 
 class CORE_EXPORT HTMLProgressElement final : public LabelableElement {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static const double IndeterminatePosition;
     static const double InvalidPosition;
 
     static HTMLProgressElement* create(Document&);
 
@@ skipping 20 matching lines @@
     LayoutObject* createLayoutObject(const ComputedStyle&) override;
     LayoutProgress* layoutProgress() const;
 
     void parseAttribute(const QualifiedName&, const AtomicString&, const AtomicString&) override;
 
     void attach(const AttachContext& = AttachContext()) override;
 
     void didElementStateChange();
     void didAddUserAgentShadowRoot(ShadowRoot&) override;
     bool isDeterminate() const;
+    void setValueWidthPercentage(double) const;
 
-    Member<ProgressValueElement> m_value;
+    Member<Element> m_value;
 };
 
 } // namespace blink
 
 #endif // HTMLProgressElement_h