Get rid of CompositingState.

sky/engine/core/rendering/compositing/CompositingState.h

-// Copyright 2013 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 SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGSTATE_H_
-#define SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGSTATE_H_
-
-namespace blink {
-
-enum CompositingState {
-    // The layer paints into its enclosing composited ancestor.
-    NotComposited = 0,
-
-    // The layer is composited, but its contents still paint into enclosing composited ancestor.
-    // In this state, paint invalidations must be sent to the enclosing composited ancestor.
-    // Typically this happens when a layer's properties need to be represented in the compositor
-    // output data structures, but it doesn't actually have any other reasons to be composited.
-    HasOwnBackingButPaintsIntoAncestor = 1,
-
-    PaintsIntoOwnBacking = 2,
-
-    // In this state, the RenderLayer subtree paints into a backing that is shared by
-    // several RenderLayer subtrees.
-    PaintsIntoGroupedBacking = 3
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGSTATE_H_