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Previously OOBE UI Dialog size was controlled from JS code.
This CL changes implementation so that dialog size is set according
to UI specifications in C++ code, and web-based ui should just fully
fit into given dialog.

Note that code in ash/wm/lock_layout_manager / lock_window_state
propagates bounds changes only to full-screen children, so
OobeUIDialogDelegate will create full-screen Widget that will
host WebUI dialog, receive all bound-changed events and update
hosted dialog size according to specs.

Bug: 1007294, 1007861
Change-Id: Ib81ec7f886cd406df98838de5af8401083de0b87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841953Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706966}