Fix sky include guards to match Chromium style

sky/engine/core/css/resolver/StyleBuilderConverter.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
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-#ifndef StyleBuilderConverter_h
-#define StyleBuilderConverter_h
+#ifndef SKY_ENGINE_CORE_CSS_RESOLVER_STYLEBUILDERCONVERTER_H_
+#define SKY_ENGINE_CORE_CSS_RESOLVER_STYLEBUILDERCONVERTER_H_
 
 #include "sky/engine/core/css/CSSValue.h"
 #include "sky/engine/core/css/CSSValueList.h"
 #include "sky/engine/core/css/resolver/StyleResolverState.h"
 #include "sky/engine/core/rendering/RenderView.h"
 #include "sky/engine/core/rendering/style/QuotesData.h"
 #include "sky/engine/core/rendering/style/ShadowList.h"
 #include "sky/engine/platform/LengthSize.h"
 #include "sky/engine/platform/fonts/FontDescription.h"
 
@@ skipping 66 matching lines @@
 AtomicString StyleBuilderConverter::convertString(StyleResolverState&, CSSValue* value)
 {
     CSSPrimitiveValue* primitiveValue = toCSSPrimitiveValue(value);
     if (primitiveValue->getValueID() == IdForNone)
         return nullAtom;
     return AtomicString(primitiveValue->getStringValue());
 }
 
 } // namespace blink
 
-#endif
+#endif  // SKY_ENGINE_CORE_CSS_RESOLVER_STYLEBUILDERCONVERTER_H_