Fix sky include guards to match Chromium style

sky/engine/public/platform/WebExternalTextureLayerClient.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:
  *
  * 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 APPLE AND ITS 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 APPLE OR ITS 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 WebExternalTextureLayerClient_h
-#define WebExternalTextureLayerClient_h
+#ifndef SKY_ENGINE_PUBLIC_PLATFORM_WEBEXTERNALTEXTURELAYERCLIENT_H_
+#define SKY_ENGINE_PUBLIC_PLATFORM_WEBEXTERNALTEXTURELAYERCLIENT_H_
 
 #include "sky/engine/public/platform/WebCommon.h"
 #include "sky/engine/public/platform/WebSize.h"
 
 namespace blink {
 
 class WebGraphicsContext3D;
 class WebExternalBitmap;
 struct WebExternalTextureMailbox;
 
 class BLINK_PLATFORM_EXPORT WebExternalTextureLayerClient {
 public:
     // Returns true and provides a mailbox if a new frame is available. If the WebExternalBitmap
     // isn't 0, then it should also be filled in with the contents of this frame.
     // Returns false if no new data is available and the old mailbox and bitmap are to be reused.
     virtual bool prepareMailbox(WebExternalTextureMailbox*, WebExternalBitmap* = 0) = 0;
 
     // Notifies the client when a mailbox is no longer in use by the compositor and provides
     // a sync point to wait on before the mailbox could be consumes again by the client. The
     // boolean flag indicates if the mailbox resource is treated as lost by client.
     virtual void mailboxReleased(const WebExternalTextureMailbox&, bool lostResource) = 0;
 
 protected:
     virtual ~WebExternalTextureLayerClient() { }
 };
 
 } // namespace blink
 
-#endif // WebExternalTextureLayerClient_h
+#endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBEXTERNALTEXTURELAYERCLIENT_H_