Fix sky include guards to match Chromium style

sky/engine/wtf/SaturatedArithmetic.h

 /*
  * 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:
  *
  *     * 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 SaturatedArithmetic_h
-#define SaturatedArithmetic_h
+#ifndef SKY_ENGINE_WTF_SATURATEDARITHMETIC_H_
+#define SKY_ENGINE_WTF_SATURATEDARITHMETIC_H_
 
 #include <stdint.h>
 #include <limits>
 #include "sky/engine/wtf/CPU.h"
 
 #if CPU(ARM) && COMPILER(GCC) && __OPTIMIZE__
 
 // If we're building ARM on GCC we replace the C++ versions with some
 // native ARM assembly for speed.
 #include "sky/engine/wtf/asm/SaturatedArithmeticARM.h"
@@ skipping 66 matching lines @@
     const unsigned intMaxForLayoutUnit =
         std::numeric_limits<int>::max() >> FractionalShift;
 
     if (value >= intMaxForLayoutUnit)
         return std::numeric_limits<int>::max();
 
     return value << FractionalShift;
 }
 
 #endif // CPU(ARM) && COMPILER(GCC)
-#endif // SaturatedArithmetic_h
+#endif  // SKY_ENGINE_WTF_SATURATEDARITHMETIC_H_