Fix sky include guards to match Chromium style

sky/engine/platform/fonts/FontDescription.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  *
  * 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.LIother.m_  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USm_
  *
  */
 
-#ifndef FontDescription_h
-#define FontDescription_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_FONTDESCRIPTION_H_
+#define SKY_ENGINE_PLATFORM_FONTS_FONTDESCRIPTION_H_
 
 #include "gen/sky/platform/FontFamilyNames.h"
 #include "sky/engine/platform/fonts/FixedPitchFontType.h"
 #include "sky/engine/platform/fonts/FontCacheKey.h"
 #include "sky/engine/platform/fonts/FontFamily.h"
 #include "sky/engine/platform/fonts/FontFeatureSettings.h"
 #include "sky/engine/platform/fonts/FontOrientation.h"
 #include "sky/engine/platform/fonts/FontSmoothingMode.h"
 #include "sky/engine/platform/fonts/FontTraits.h"
 #include "sky/engine/platform/fonts/FontWidthVariant.h"
@@ skipping 225 matching lines @@
         && m_widthVariant == other.m_widthVariant
         && m_script == other.m_script
         && m_syntheticBold == other.m_syntheticBold
         && m_syntheticItalic == other.m_syntheticItalic
         && m_featureSettings == other.m_featureSettings
         && m_subpixelTextPosition == other.m_subpixelTextPosition;
 }
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_PLATFORM_FONTS_FONTDESCRIPTION_H_