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This patch changes how editing forces legacy layout to the one
added for form controls[1] to use legacy layout tree for nested editable, e.g.
  <div contenteditable>
  legacy layout tree
    <div contenteditable=false>
      non-editable block in editable block should be legacy
    </div>
  </div>

This patch continues http://crrev.com/c/880542

[1] http://crrev.com/c/875511 Change form controls not to use LayoutNG

Bug: 714962
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I78d44fc82b3de5e647b67ee6aa7733db62e344b8
Reviewed-on: https://chromium-review.googlesource.com/880530
Commit-Queue: Yoshifumi Inoue <yosin@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531861}