Fix sky include guards to match Chromium style

sky/engine/wtf/DoublyLinkedList.h

 /*
  * Copyright (C) 2011 Apple 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 INC. 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 INC. 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 DoublyLinkedList_h
-#define DoublyLinkedList_h
+#ifndef SKY_ENGINE_WTF_DOUBLYLINKEDLIST_H_
+#define SKY_ENGINE_WTF_DOUBLYLINKEDLIST_H_
 
 namespace WTF {
 
 // This class allows nodes to share code without dictating data member layout.
 template<typename T> class DoublyLinkedListNode {
 public:
     DoublyLinkedListNode();
 
     void setPrev(T*);
     void setNext(T*);
@@ skipping 146 matching lines @@
     if (node)
         remove(node);
     return node;
 }
 
 } // namespace WTF
 
 using WTF::DoublyLinkedListNode;
 using WTF::DoublyLinkedList;
 
-#endif
+#endif  // SKY_ENGINE_WTF_DOUBLYLINKEDLIST_H_