Fix sky include guards to match Chromium style

sky/engine/wtf/CurrentTime.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  * 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.
@@ skipping 11 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 CurrentTime_h
-#define CurrentTime_h
+#ifndef SKY_ENGINE_WTF_CURRENTTIME_H_
+#define SKY_ENGINE_WTF_CURRENTTIME_H_
 
 #include "sky/engine/wtf/WTFExport.h"
 
 namespace WTF {
 
 // Returns the current UTC time in seconds, counted from January 1, 1970.
 // Precision varies depending on platform but is usually as good or better
 // than a millisecond.
 WTF_EXPORT double currentTime();
 
@@ skipping 11 matching lines @@
 void setCurrentTimeFunction(TimeFunction);
 void setMonotonicallyIncreasingTimeFunction(TimeFunction);
 
 
 } // namespace WTF
 
 using WTF::currentTime;
 using WTF::currentTimeMS;
 using WTF::monotonicallyIncreasingTime;
 
-#endif // CurrentTime_h
+#endif  // SKY_ENGINE_WTF_CURRENTTIME_H_