Fix sky include guards to match Chromium style

sky/engine/core/css/parser/MediaQueryBlockWatcher.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 MediaQueryBlockWatcher_h
-#define MediaQueryBlockWatcher_h
+#ifndef SKY_ENGINE_CORE_CSS_PARSER_MEDIAQUERYBLOCKWATCHER_H_
+#define SKY_ENGINE_CORE_CSS_PARSER_MEDIAQUERYBLOCKWATCHER_H_
 
 namespace blink {
 
 class MediaQueryToken;
 
 class MediaQueryBlockWatcher {
 public:
 
     MediaQueryBlockWatcher();
     void handleToken(const MediaQueryToken&);
     unsigned blockLevel() const { return m_blockLevel; }
 
 private:
     unsigned m_blockLevel;
 };
 
 } // namespace
 
-#endif // MediaQueryBlockWatcher_h
+#endif  // SKY_ENGINE_CORE_CSS_PARSER_MEDIAQUERYBLOCKWATCHER_H_