cc : Delete target id and content target id from transform nodes

cc/trees/transform_node.h

 // Copyright 2016 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_TRANSFORM_NODE_H_
 #define CC_TREES_TRANSFORM_NODE_H_
 
 #include "cc/cc_export.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/geometry/scroll_offset.h"
@@ skipping 130 matching lines @@
 };
 
 // TODO(sunxd): move this into PropertyTrees::cached_data_.
 struct CC_EXPORT TransformCachedNodeData {
   TransformCachedNodeData();
   TransformCachedNodeData(const TransformCachedNodeData& other);
   ~TransformCachedNodeData();
 
   gfx::Transform from_screen;
   gfx::Transform to_screen;
-  int target_id;
-  // This id is used for all content that draws into a render surface associated
-  // with this transform node.
-  int content_target_id;
 
   bool is_showing_backface : 1;
 
   bool operator==(const TransformCachedNodeData& other) const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_TRANSFORM_NODE_H_