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

Source/core/css/StyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
  *
  * 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.
  *
@@ skipping 41 matching lines @@
 
 PassRefPtr<CSSRule> StyleRuleBase::createCSSOMWrapper(CSSRule* parentRule) const
 {
     return createCSSOMWrapper(0, parentRule);
 }
 
 void StyleRuleBase::destroy()
 {
     switch (type()) {
     case Style:
-        delete static_cast<StyleRule*>(this);
+        delete toStyleRule(this);
         return;
     case Page:
         delete static_cast<StyleRulePage*>(this);
         return;
     case FontFace:
         delete static_cast<StyleRuleFontFace*>(this);
         return;
     case Media:
         delete static_cast<StyleRuleMedia*>(this);
         return;
@@ skipping 63 matching lines @@
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 PassRefPtr<CSSRule> StyleRuleBase::createCSSOMWrapper(CSSStyleSheet* parentSheet, CSSRule* parentRule) const
 {
     RefPtr<CSSRule> rule;
     StyleRuleBase* self = const_cast<StyleRuleBase*>(this);
     switch (type()) {
     case Style:
-        rule = CSSStyleRule::create(static_cast<StyleRule*>(self), parentSheet);
+        rule = CSSStyleRule::create(toStyleRule(self), parentSheet);
         break;
     case Page:
         rule = CSSPageRule::create(static_cast<StyleRulePage*>(self), parentSheet);
         break;
     case FontFace:
         rule = CSSFontFaceRule::create(static_cast<StyleRuleFontFace*>(self), parentSheet);
         break;
     case Media:
         rule = CSSMediaRule::create(static_cast<StyleRuleMedia*>(self), parentSheet);
         break;
@@ skipping 232 matching lines @@
         m_properties = m_properties->mutableCopy();
     return static_cast<MutableStylePropertySet*>(m_properties.get());
 }
 
 void StyleRuleFilter::setProperties(PassRefPtr<StylePropertySet> properties)
 {
     m_properties = properties;
 }
 
 } // namespace WebCore