Remove most of the old compositing code.

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

Index: sky/engine/core/rendering/compositing/CompositingRequirementsUpdater.h
diff --git a/sky/engine/core/rendering/compositing/CompositingRequirementsUpdater.h b/sky/engine/core/rendering/compositing/CompositingRequirementsUpdater.h
deleted file mode 100644
index 14c3e9ff64fcbc0e391bd35cd42ff26936469e4b..0000000000000000000000000000000000000000
--- a/sky/engine/core/rendering/compositing/CompositingRequirementsUpdater.h
+++ /dev/null
@@ -1,69 +0,0 @@
-/*
- * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2014 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. ``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 COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#ifndef SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGREQUIREMENTSUPDATER_H_
-#define SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGREQUIREMENTSUPDATER_H_
-
-#include "sky/engine/platform/geometry/IntRect.h"
-#include "sky/engine/platform/graphics/CompositingReasons.h"
-#include "sky/engine/wtf/Vector.h"
-
-namespace blink {
-
-class CompositingReasonFinder;
-class RenderLayer;
-class RenderObject;
-class RenderView;
-
-class CompositingRequirementsUpdater {
-public:
-    CompositingRequirementsUpdater(RenderView&, CompositingReasonFinder&);
-    ~CompositingRequirementsUpdater();
-
-    //  Recurse through the layers in z-index and overflow order (which is equivalent to painting order)
-    //  For the z-order children of a compositing layer:
-    //      If a child layers has a compositing layer, then all subsequent layers must
-    //      be compositing in order to render above that layer.
-    //
-    //      If a child in the negative z-order list is compositing, then the layer itself
-    //      must be compositing so that its contents render over that child.
-    //      This implies that its positive z-index children must also be compositing.
-    //
-    void update(RenderLayer* root);
-
-private:
-    class OverlapMap;
-    class RecursionData;
-
-    void updateRecursive(RenderLayer* ancestorLayer, RenderLayer* currentLayer, OverlapMap&, RecursionData&, bool& descendantHas3DTransform, Vector<RenderLayer*>& unclippedDescendants, IntRect& absoluteDecendantBoundingBox);
-
-    RenderView& m_renderView;
-    CompositingReasonFinder& m_compositingReasonFinder;
-};
-
-} // namespace blink
-
-#endif  // SKY_ENGINE_CORE_RENDERING_COMPOSITING_COMPOSITINGREQUIREMENTSUPDATER_H_