Fix sky include guards to match Chromium style

sky/engine/core/rendering/ClipRectsCache.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 ClipRectsCache_h
-#define ClipRectsCache_h
+#ifndef SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_
+#define SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_
 
 #include "sky/engine/core/rendering/ClipRects.h"
 
 namespace blink {
 
 enum ClipRectsCacheSlot {
     // Relative to the ancestor treated as the root (e.g. transformed layer). Used for hit testing.
     RootRelativeClipRects,
 
     // Relative to the RenderView's layer. Used for compositing overlap testing.
@@ skipping 31 matching lines @@
         ASSERT(slot < NumberOfClipRectsCacheSlots);
         m_entries[slot] = Entry();
     }
 
 private:
     Entry m_entries[NumberOfClipRectsCacheSlots];
 };
 
 } // namespace blink
 
-#endif // ClipRectsCache_h
+#endif  // SKY_ENGINE_CORE_RENDERING_CLIPRECTSCACHE_H_