[PATCH 1 of 2] shelve: rewrite "x in y.children()" as "y in x.parents()"

[Yuya Nishihara]

On Sat, 17 Jun 2017 23:13:54 -0700, Martin von Zweigbergk via Mercurial-devel wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1497766179 25200
> #      Sat Jun 17 23:09:39 2017 -0700
> # Node ID d8c3f47d162dafa180996d3dfd8b59f1e901735b
> # Parent  8e02829bec6135f4ec96bb68b54de2c3f56dbc09
> shelve: rewrite "x in y.children()" as "y in x.parents()"

Queued these, thanks.