Fix sky include guards to match Chromium style

sky/engine/core/page/Chrome.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  * Copyright (C) 2012, Samsung Electronics. 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 Chrome_h
-#define Chrome_h
+#ifndef SKY_ENGINE_CORE_PAGE_CHROME_H_
+#define SKY_ENGINE_CORE_PAGE_CHROME_H_
 
 #include "sky/engine/core/loader/NavigationPolicy.h"
 #include "sky/engine/core/page/FocusType.h"
 #include "sky/engine/platform/Cursor.h"
 #include "sky/engine/platform/HostWindow.h"
 #include "sky/engine/wtf/Forward.h"
 
 namespace blink {
 
 class ChromeClient;
@@ skipping 50 matching lines @@
 
 private:
     Chrome(Page*, ChromeClient*);
 
     Page* m_page;
     ChromeClient* m_client;
 };
 
 }
 
-#endif // Chrome_h
+#endif  // SKY_ENGINE_CORE_PAGE_CHROME_H_