Remove parts of //cc we aren't using

cc/trees/draw_property_utils.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 CC_TREES_DRAW_PROPERTY_UTILS_H_
-#define CC_TREES_DRAW_PROPERTY_UTILS_H_
-
-#include "cc/base/cc_export.h"
-
-namespace gfx {
-class Rect;
-class Transform;
-}  // namespace gfx
-
-namespace cc {
-
-class ClipTree;
-class Layer;
-class OpacityTree;
-class TransformTree;
-
-// Computes combined clips for every node in |clip_tree|. This function requires
-// that |transform_tree| has been updated via |ComputeTransforms|.
-// TODO(vollick): ComputeClips and ComputeTransforms will eventually need to be
-// done on both threads.
-void CC_EXPORT
-ComputeClips(ClipTree* clip_tree, const TransformTree& transform_tree);
-
-// Computes combined (screen space) transforms for every node in the transform
-// tree. This must be done prior to calling |ComputeClips|.
-void CC_EXPORT ComputeTransforms(TransformTree* transform_tree);
-
-// Computes the visible content rect for every layer under |root_layer|. The
-// visible content rect is the clipped content space rect that will be used for
-// recording.
-void CC_EXPORT
-ComputeVisibleRectsUsingPropertyTrees(Layer* root_layer,
-                                      const Layer* page_scale_layer,
-                                      float page_scale_factor,
-                                      float device_scale_factor,
-                                      const gfx::Rect& viewport,
-                                      const gfx::Transform& device_transform,
-                                      TransformTree* transform_tree,
-                                      ClipTree* clip_tree,
-                                      OpacityTree* opacity_tree);
-
-}  // namespace cc
-
-#endif  // CC_TREES_DRAW_PROPERTY_UTILS_H_