Fix sky include guards to match Chromium style

sky/engine/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. 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.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 CSSPrimitiveValueMappings_h
-#define CSSPrimitiveValueMappings_h
+#ifndef SKY_ENGINE_CORE_CSS_CSSPRIMITIVEVALUEMAPPINGS_H_
+#define SKY_ENGINE_CORE_CSS_CSSPRIMITIVEVALUEMAPPINGS_H_
 
 #include "gen/sky/core/CSSValueKeywords.h"
 #include "sky/engine/core/css/CSSCalculationValue.h"
 #include "sky/engine/core/css/CSSPrimitiveValue.h"
 #include "sky/engine/core/css/CSSPrimitiveValueMappings.h"
 #include "sky/engine/core/css/CSSToLengthConversionData.h"
 #include "sky/engine/core/rendering/style/LineClampValue.h"
 #include "sky/engine/core/rendering/style/RenderStyleConstants.h"
 #include "sky/engine/platform/Length.h"
 #include "sky/engine/platform/fonts/FontDescription.h"
@@ skipping 3549 matching lines @@
         return ScrollBehaviorSmooth;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return ScrollBehaviorInstant;
 }
 
 }
 
-#endif
+#endif  // SKY_ENGINE_CORE_CSS_CSSPRIMITIVEVALUEMAPPINGS_H_