Fix sky include guards to match Chromium style

sky/engine/platform/fonts/AlternateFontFamily.h

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2013 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
@@ skipping 10 matching lines @@
  * 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 AlternateFontFamily_h
-#define AlternateFontFamily_h
+#ifndef SKY_ENGINE_PLATFORM_FONTS_ALTERNATEFONTFAMILY_H_
+#define SKY_ENGINE_PLATFORM_FONTS_ALTERNATEFONTFAMILY_H_
 
 #include "sky/engine/platform/fonts/FontDescription.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 
 namespace blink {
 
 // We currently do not support bitmap fonts on windows.
 // Instead of trying to construct a bitmap font and then going down the fallback path map
 // certain common bitmap fonts to their truetype equivalent up front.
 inline const AtomicString& adjustFamilyNameToAvoidUnsupportedFonts(const AtomicString& familyName)
@@ skipping 54 matching lines @@
     case FontDescription::FantasyFamily:
         return fantasyStr;
     default:
         // Let the caller use the system default font.
         return emptyAtom;
     }
 }
 
 } // namespace blink
 
-#endif // AlternateFontFamily_h
+#endif  // SKY_ENGINE_PLATFORM_FONTS_ALTERNATEFONTFAMILY_H_