Do not use LayoutProgress for a UA shadow element of a PROGRESS element.

third_party/WebKit/Source/core/html/shadow/ProgressShadowElement.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 14 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/html/shadow/ProgressShadowElement.h"
 
 #include "core/HTMLNames.h"
 #include "core/html/HTMLProgressElement.h"
-#include "core/layout/LayoutProgress.h"
+#include "core/layout/LayoutObject.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 ProgressShadowElement::ProgressShadowElement(Document& document)
     : HTMLDivElement(document)
 {
 }
 
 HTMLProgressElement* ProgressShadowElement::progressElement() const
 {
     return toHTMLProgressElement(shadowHost());
 }
 
 bool ProgressShadowElement::layoutObjectIsNeeded(const ComputedStyle& style)
 {
     LayoutObject* progressLayoutObject = progressElement()->layoutObject();
     return progressLayoutObject && !progressLayoutObject->style()->hasAppearance() && HTMLDivElement::layoutObjectIsNeeded(style);
 }
 
 inline ProgressInnerElement::ProgressInnerElement(Document& document)
     : ProgressShadowElement(document)
 {
 }
 
 DEFINE_NODE_FACTORY(ProgressInnerElement)
 
-LayoutObject* ProgressInnerElement::createLayoutObject(const ComputedStyle&)
-{
-    return new LayoutProgress(this);
-}
-
 bool ProgressInnerElement::layoutObjectIsNeeded(const ComputedStyle& style)
 {
     if (progressElement()->openShadowRoot())
         return HTMLDivElement::layoutObjectIsNeeded(style);
 
     LayoutObject* progressLayoutObject = progressElement()->layoutObject();
     return progressLayoutObject && !progressLayoutObject->style()->hasAppearance() && HTMLDivElement::layoutObjectIsNeeded(style);
 }
 
 inline ProgressBarElement::ProgressBarElement(Document& document)
     : ProgressShadowElement(document)
 {
 }
 
 DEFINE_NODE_FACTORY(ProgressBarElement)
 
 ProgressValueElement::ProgressValueElement(Document& document)
     : ProgressShadowElement(document)
 {
 }
 
 void ProgressValueElement::setWidthPercentage(double width)
 {
     setInlineStyleProperty(CSSPropertyWidth, width, CSSPrimitiveValue::UnitType::Percentage);
 }
 
 DEFINE_NODE_FACTORY(ProgressValueElement)
 
 } // namespace blink