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NGPhysicalFragment needs special handling on the destruction
rather than being destroyed by WTF::RefCounted. However, existing
style of the destruction hook will be unavailable after unifying
base::RefCounted and WTF::RefCounted.

This CL adds a proper way to inject the destruction function of a
ref counted object. The destruction function will be injected to
base::RefCounted after the unification.

Bug: 763844
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: If763525a55c4621abd711a16a531817528a42b69
Reviewed-on: https://chromium-review.googlesource.com/681955Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504365}