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Removes use of GridLayout to agree on column width for textfields. This
is replaced by linking textfield views together to make them agree on a
shared width.

This is a prerequisite for dynamically adding/removing items to
DialogModel as GridLayout does not support inserting/removing rows.

Remaining GridLayout dependencies are that the dynamic row spacing is
set up using padding rows.

Bug: 1106422
Change-Id: I76a3823c12dab20aa047e263e27dfbda53003b24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508158Reviewed-by: Keren Zhu <kerenzhu@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823237}