Fix sky include guards to match Chromium style

sky/engine/public/web/WebBeginFrameArgs.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef WebBeginFrameArgs_h
-#define WebBeginFrameArgs_h
+#ifndef SKY_ENGINE_PUBLIC_WEB_WEBBEGINFRAMEARGS_H_
+#define SKY_ENGINE_PUBLIC_WEB_WEBBEGINFRAMEARGS_H_
 
 namespace blink {
 
 struct WebBeginFrameArgs {
     WebBeginFrameArgs(double lastFrameTimeMonotonic, double deadline, double interval)
         : lastFrameTimeMonotonic(lastFrameTimeMonotonic)
         , deadline(deadline)
         , interval(interval)
     { }
 
@@ skipping 15 matching lines @@
 
     // Time in CLOCK_MONOTONIC by which the renderer should finish producing the current frame. 0 means a deadline wasn't set.
     double deadline;
 
     // Expected delta between two successive frame times. 0 if a regular interval isn't available.
     double interval;
 };
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_PUBLIC_WEB_WEBBEGINFRAMEARGS_H_