Fix sky include guards to match Chromium style

sky/engine/core/rendering/line/LineWidth.h

 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. 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.
  * 2. Redistributions in binary form must reproduce the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer in the documentation and/or other materials
  *    provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  * COPYRIGHT HOLDER OR 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 LineWidth_h
-#define LineWidth_h
+#ifndef SKY_ENGINE_CORE_RENDERING_LINE_LINEWIDTH_H_
+#define SKY_ENGINE_CORE_RENDERING_LINE_LINEWIDTH_H_
 
 #include "sky/engine/platform/LayoutUnit.h"
 
 namespace blink {
 
 class FloatingObject;
 class RenderObject;
 class RenderBlockFlow;
 
 enum IndentTextOrNot { DoNotIndentText, IndentText };
@@ skipping 34 matching lines @@
     float m_committedWidth;
     float m_trailingWhitespaceWidth;
     float m_left;
     float m_right;
     float m_availableWidth;
     IndentTextOrNot m_shouldIndentText;
 };
 
 }
 
-#endif // LineWidth_h
+#endif  // SKY_ENGINE_CORE_RENDERING_LINE_LINEWIDTH_H_