Cleanup: Start using toFoo methods as part of newly adopted coding guideline.

Source/core/html/HTMLProgressElement.cpp

 /*
  * 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
@@ skipping 50 matching lines @@
 {
     if (!style->hasAppearance() || hasAuthorShadowRoot())
         return RenderObject::createObject(this, style);
 
     return new RenderProgress(this);
 }
 
 RenderProgress* HTMLProgressElement::renderProgress() const
 {
     if (renderer() && renderer()->isProgress())
-        return static_cast<RenderProgress*>(renderer());
+        return toRenderProgress(renderer());
 
     RenderObject* renderObject = userAgentShadowRoot()->firstChild()->renderer();
     ASSERT_WITH_SECURITY_IMPLICATION(!renderObject || renderObject->isProgress());
-    return static_cast<RenderProgress*>(renderObject);
+    return toRenderProgress(renderObject);
 }
 
 void HTMLProgressElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == valueAttr)
         didElementStateChange();
     else if (name == maxAttr)
         didElementStateChange();
     else
         LabelableElement::parseAttribute(name, value);
@@ skipping 77 matching lines @@
 
     inner->appendChild(bar);
 }
 
 bool HTMLProgressElement::shouldAppearIndeterminate() const
 {
     return !isDeterminate();
 }
 
 } // namespace