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... rather than on the stack. In practice, although the change
brings no behavior difference, it will allow WaylandTest ctor
to set the proper KeyboardLayoutEngine instance before the
WaylandConnection object is created, which in turn will allow
WaylandKeyboardTest unittests to be fixed (follow up patch).

BUG=None

Change-Id: I7f18965a90ea468591c7a6ac7a473c31a1a827cf
Reviewed-on: https://chromium-review.googlesource.com/847612Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#526710}