Fix sky include guards to match Chromium style

sky/engine/core/rendering/EllipsisBox.h

 /**
  * Copyright (C) 2003, 2006 Apple Computer, Inc.
  *
  * 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 EllipsisBox_h
-#define EllipsisBox_h
+#ifndef SKY_ENGINE_CORE_RENDERING_ELLIPSISBOX_H_
+#define SKY_ENGINE_CORE_RENDERING_ELLIPSISBOX_H_
 
 #include "sky/engine/core/rendering/InlineBox.h"
 
 namespace blink {
 
 class HitTestRequest;
 class HitTestResult;
 
 class EllipsisBox final : public InlineBox {
 public:
@@ skipping 22 matching lines @@
     InlineBox* markupBox() const;
 
     bool m_shouldPaintMarkupBox;
     int m_height;
     AtomicString m_str;
     RenderObject::SelectionState m_selectionState;
 };
 
 } // namespace blink
 
-#endif // EllipsisBox_h
+#endif  // SKY_ENGINE_CORE_RENDERING_ELLIPSISBOX_H_