Fix sky include guards to match Chromium style

sky/engine/core/css/StyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 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.
  *
  * 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 StyleRule_h
-#define StyleRule_h
+#ifndef SKY_ENGINE_CORE_CSS_STYLERULE_H_
+#define SKY_ENGINE_CORE_CSS_STYLERULE_H_
 
 #include "sky/engine/core/css/CSSSelectorList.h"
 #include "sky/engine/core/css/MediaList.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/RefPtr.h"
 
 namespace blink {
 
 class CSSRule;
 class CSSStyleRule;
@@ skipping 178 matching lines @@
     DEFINE_TYPE_CASTS(StyleRule##Type, StyleRuleBase, rule, rule->is##Type##Rule(), rule.is##Type##Rule())
 
 DEFINE_TYPE_CASTS(StyleRule, StyleRuleBase, rule, rule->isStyleRule(), rule.isStyleRule());
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Filter);
 
 } // namespace blink
 
-#endif // StyleRule_h
+#endif  // SKY_ENGINE_CORE_CSS_STYLERULE_H_