Remove unused variable layout_object.

third_party/WebKit/Source/core/layout/ng/ng_layout_result.cc

 // 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.
 
 #include "core/layout/ng/ng_layout_result.h"
 
 namespace blink {
 
 NGLayoutResult::NGLayoutResult(
     PassRefPtr<NGPhysicalFragment> physical_fragment,
     PersistentHeapLinkedHashSet<WeakMember<NGBlockNode>>&
         out_of_flow_descendants,
     Vector<NGStaticPosition> out_of_flow_positions,
     Vector<RefPtr<NGFloatingObject>>& unpositioned_floats)
     : physical_fragment_(std::move(physical_fragment)),
-      layout_object_(nullptr),
       out_of_flow_descendants_(out_of_flow_descendants),
       out_of_flow_positions_(out_of_flow_positions) {
   unpositioned_floats_.swap(unpositioned_floats);
 }
 
 }  // namespace blink