[LayoutNG] PODify NGLayoutInputNode and sub-classes.

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

 // Copyright 2017 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_block_child_iterator.h"
 
 #include "core/layout/ng/ng_block_break_token.h"
 #include "core/layout/ng/ng_layout_input_node.h"
 
 namespace blink {
 
-NGBlockChildIterator::NGBlockChildIterator(NGLayoutInputNode* first_child,
+NGBlockChildIterator::NGBlockChildIterator(NGLayoutInputNode first_child,
                                            NGBlockBreakToken* break_token)
     : child_(first_child), break_token_(break_token), child_token_idx_(0) {}
 
 NGBlockChildIterator::Entry NGBlockChildIterator::NextChild() {
   NGBreakToken* child_break_token = nullptr;
 
   if (break_token_) {
     // If we're resuming layout after a fragmentainer break, we need to skip
     // siblings that we're done with. We may have been able to fully lay out
     // some node(s) preceding a node that we had to break inside (and therefore
@@ skipping 15 matching lines @@
       if (child_break_token_candidate->InputNode() != child_)
         break;
 
       ++child_token_idx_;
 
       // We have only found a node if its break token is unfinished.
       if (!child_break_token_candidate->IsFinished()) {
         child_break_token = child_break_token_candidate;
         break;
       }
-    } while ((child_ = child_->NextSibling()));
+    } while ((child_ = child_.NextSibling()));
   }
 
-  NGLayoutInputNode* child = child_;
+  NGLayoutInputNode child = child_;
   if (child_)
-    child_ = child_->NextSibling();
+    child_ = child_.NextSibling();
 
   return Entry(child, child_break_token);
 }
 
 }  // namespace blink