Fix sky include guards to match Chromium style

sky/engine/core/css/CSSAspectRatioValue.h

 /*
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, 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.
  */
 
-#ifndef CSSAspectRatioValue_h
-#define CSSAspectRatioValue_h
+#ifndef SKY_ENGINE_CORE_CSS_CSSASPECTRATIOVALUE_H_
+#define SKY_ENGINE_CORE_CSS_CSSASPECTRATIOVALUE_H_
 
 #include "sky/engine/core/css/CSSValue.h"
 
 namespace blink {
 
 class CSSAspectRatioValue : public CSSValue {
 public:
     static PassRefPtr<CSSAspectRatioValue> create(float numeratorValue, float denominatorValue)
     {
         return adoptRef(new CSSAspectRatioValue(numeratorValue, denominatorValue));
@@ skipping 15 matching lines @@
     }
 
     float m_numeratorValue;
     float m_denominatorValue;
 };
 
 DEFINE_CSS_VALUE_TYPE_CASTS(CSSAspectRatioValue, isAspectRatioValue());
 
 }
 
-#endif
+#endif  // SKY_ENGINE_CORE_CSS_CSSASPECTRATIOVALUE_H_