Resolve ApplyAutoMargins's TODO in NGBlockLayoutAlgorithm.

third_party/WebKit/Source/core/layout/ng/ng_length_utils.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 NGLengthUtils_h
 #define NGLengthUtils_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_direction.h"
 #include "core/layout/ng/ng_writing_mode.h"
@@ skipping 53 matching lines @@
 CORE_EXPORT NGBoxStrut ComputePadding(const NGConstraintSpace&,
                                       const ComputedStyle&);
 
 // Resolves margin: auto in the inline direction after a box has been laid out.
 // This uses the container size from the constraint space and the box size from
 // the fragment to compute the margins that are auto, if any, and adjusts
 // the given NGBoxStrut accordingly.
 CORE_EXPORT void ApplyAutoMargins(const NGConstraintSpace&,
                                   const ComputedStyle&,
                                   const NGFragment&,
-                                  NGBoxStrut& margins);
+                                  NGBoxStrut* margins);
 
 }  // namespace blink
 
 #endif  // NGLengthUtils_h