Fix sky include guards to match Chromium style

sky/engine/bindings/core/v8/V8ValueCache.h

 /*
  * Copyright (C) 2009 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 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
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  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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-#ifndef V8ValueCache_h
-#define V8ValueCache_h
+#ifndef SKY_ENGINE_BINDINGS_CORE_V8_V8VALUECACHE_H_
+#define SKY_ENGINE_BINDINGS_CORE_V8_V8VALUECACHE_H_
 
 #include "sky/engine/bindings/core/v8/V8PersistentValueMap.h"
 #include "sky/engine/wtf/HashMap.h"
 #include "sky/engine/wtf/RefPtr.h"
 #include "sky/engine/wtf/text/AtomicString.h"
 #include "sky/engine/wtf/text/WTFString.h"
 #include "v8/include/v8.h"
 
 namespace blink {
 
@@ skipping 54 matching lines @@
     StringCacheMapTraits::MapType::PersistentValueReference m_lastV8String;
 
     // Note: RefPtr is a must as we cache by StringImpl* equality, not identity
     // hence lastStringImpl might be not a key of the cache (in sense of identity)
     // and hence it's not refed on addition.
     RefPtr<StringImpl> m_lastStringImpl;
 };
 
 } // namespace blink
 
-#endif // V8ValueCache_h
+#endif  // SKY_ENGINE_BINDINGS_CORE_V8_V8VALUECACHE_H_