Fix sky include guards to match Chromium style

sky/engine/platform/graphics/skia/NativeImageSkia.h

 /*
  * Copyright (c) 2008, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 10 matching lines @@
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER 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 NativeImageSkia_h
-#define NativeImageSkia_h
+#ifndef SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_
+#define SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_
 
 #include "sky/engine/platform/PlatformExport.h"
 #include "sky/engine/platform/geometry/IntSize.h"
 #include "sky/engine/platform/graphics/GraphicsTypes.h"
 #include "sky/engine/wtf/Forward.h"
 #include "sky/engine/wtf/PassRefPtr.h"
 #include "sky/engine/wtf/RefCounted.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkSize.h"
@@ skipping 119 matching lines @@
     // those requests individually are small and would not otherwise be cached.
     //
     // We also track scaling information and destination subset for the scaled
     // image. See comments for ImageResourceInfo.
     mutable ImageResourceInfo m_cachedImageInfo;
     mutable int m_resizeRequests;
 };
 
 } // namespace blink
 
-#endif  // NativeImageSkia_h
+#endif  // SKY_ENGINE_PLATFORM_GRAPHICS_SKIA_NATIVEIMAGESKIA_H_