Fix sky include guards to match Chromium style

sky/engine/core/editing/DOMSelection.h

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2012 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.
@@ skipping 10 matching lines @@
  * 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 DOMSelection_h
-#define DOMSelection_h
+#ifndef SKY_ENGINE_CORE_EDITING_DOMSELECTION_H_
+#define SKY_ENGINE_CORE_EDITING_DOMSELECTION_H_
 
 #include "sky/engine/bindings/core/v8/ScriptWrappable.h"
 #include "sky/engine/core/frame/DOMWindowProperty.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/Forward.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 
 namespace blink {
 
@@ skipping 64 matching lines @@
 
     bool isValidForPosition(Node*) const;
 
     void addConsoleError(const String& message);
 
     RawPtr<const TreeScope> m_treeScope;
 };
 
 } // namespace blink
 
-#endif // DOMSelection_h
+#endif  // SKY_ENGINE_CORE_EDITING_DOMSELECTION_H_