Remove parts of //cc we aren't using

cc/layers/layer_position_constraint.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 CC_LAYERS_LAYER_POSITION_CONSTRAINT_H_
-#define CC_LAYERS_LAYER_POSITION_CONSTRAINT_H_
-
-#include "cc/base/cc_export.h"
-
-namespace cc {
-
-class CC_EXPORT LayerPositionConstraint {
- public:
-  LayerPositionConstraint();
-
-  void set_is_fixed_position(bool fixed) { is_fixed_position_ = fixed; }
-  bool is_fixed_position() const { return is_fixed_position_; }
-  void set_is_fixed_to_right_edge(bool fixed) {
-    is_fixed_to_right_edge_ = fixed;
-  }
-  bool is_fixed_to_right_edge() const { return is_fixed_to_right_edge_; }
-  void set_is_fixed_to_bottom_edge(bool fixed) {
-    is_fixed_to_bottom_edge_ = fixed;
-  }
-  bool is_fixed_to_bottom_edge() const { return is_fixed_to_bottom_edge_; }
-
-  bool operator==(const LayerPositionConstraint&) const;
-  bool operator!=(const LayerPositionConstraint&) const;
-
- private:
-  bool is_fixed_position_       : 1;
-  bool is_fixed_to_right_edge_  : 1;
-  bool is_fixed_to_bottom_edge_ : 1;
-};
-
-}  // namespace cc
-
-#endif  // CC_LAYERS_LAYER_POSITION_CONSTRAINT_H_