[LayoutNG] Allow block-flow layout to be fragmented using new approach.

third_party/WebKit/Source/core/layout/ng/ng_block_break_token.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_break_token.h"
 
 #include "core/layout/ng/ng_block_node.h"
 
 namespace blink {
 
 NGBlockBreakToken::NGBlockBreakToken(
     NGBlockNode* node,
     LayoutUnit used_block_size,
     HeapVector<Member<NGBreakToken>>& child_break_tokens)
     : NGBreakToken(kBlockBreakToken, kUnfinished, node),
       used_block_size_(used_block_size) {
   child_break_tokens_.swap(child_break_tokens);
 }
 
-NGBlockBreakToken::NGBlockBreakToken(NGBlockNode* node)
+NGBlockBreakToken::NGBlockBreakToken(NGLayoutInputNode* node)
     : NGBreakToken(kBlockBreakToken, kFinished, node) {}
 
-NGBlockBreakToken::NGBlockBreakToken(NGBlockNode* node, LayoutUnit break_offset)
-    : NGBreakToken(kBlockBreakToken, kUnfinished, node),
-      break_offset_(break_offset) {}
-
 }  // namespace blink