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Focusing element marked as "focus-on-show" is done by oobe-dialog's
show() method. MultiStepBehavior triggers this method for elements
marked as for-step, but enrollment_screen used legacy layout where
each oobe-dialog was additionally wrapped in the <div>, and for-step
was set on the enclosing div instead of oobe-dialog.
As a result, show() was not called on corresponding oobe-dialog upon
step switch, and default focus was not set

Bug: 1021608
Change-Id: I5d103f735ff5155a190c0a74c7d215fe293a2c83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414189Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807869}