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A multicol container establishes anonymous child fragments to represent
columns, and the contents (lines, blocks, whatever) are children of
those column fragments. We therefore need to examine grandchildren of
the multicol container to find lines to create RootInlineBox objects.

Examining the grandchildren previously wasn't necessary, and support for
writing back direct line box children used to work, as of
block with inline children would always create an anonymous child
fragment to hold all inline children. However, creation of said
(unnecessary) anonymous fragment was removed later on, and legacy
write-back of lines inside columns broke again.

https: //chromium-review.googlesource.com/716877 . It worked, because a
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: I73fd038d99c4a8b1dc0982e6f3f3a6e0572a44ba
Reviewed-on: https://chromium-review.googlesource.com/768671Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Morten Stenshorne <mstensho@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516825}