[LayoutNG] Make NGBlockNode return a const style reference.

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.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 NGBlockLayoutAlgorithm_h
 #define NGBlockLayoutAlgorithm_h
 
 #include "core/CoreExport.h"
 #include "core/layout/ng/ng_block_node.h"
 #include "core/layout/ng/ng_box_fragment.h"
@@ skipping 90 matching lines @@
   // fragment's parent.
   NGLogicalOffset CalculateRelativeOffset(const NGBoxFragment& fragment);
 
   NGLogicalOffset GetChildSpaceOffset() const {
     return NGLogicalOffset(border_and_padding_.inline_start, content_size_);
   }
 
   // Read-only Getters.
   const ComputedStyle& CurrentChildStyle() const {
     DCHECK(current_child_);
-    return *current_child_->Style();
+    return current_child_->Style();
   }
 
   const NGConstraintSpace& ConstraintSpace() const {
     return *constraint_space_;
   }
 
   const NGConstraintSpace& CurrentChildConstraintSpace() const {
     return *space_for_current_child_.get();
   }
 
@@ skipping 23 matching lines @@
   // MarginStrut for the previous child.
   NGMarginStrut curr_margin_strut_;
   NGLogicalOffset bfc_offset_;
   NGLogicalOffset curr_bfc_offset_;
   NGBoxStrut curr_child_margins_;
 };
 
 }  // namespace blink
 
 #endif  // NGBlockLayoutAlgorithm_h