GitLab

Remove a line that sets |selectedShareTarget| null on the discovery
page so that the selected share target is preserved on the
confirmation page.

Adjust margins and fix vertical centering of content on the
confimation page. Allow the content to expand horizontally instead of
fixing the width.

Screenshot:
https://screenshot.googleplex.com/B7Dc6rZPPSHkTip.png

Bug: b/163036847
Change-Id: Ie41d7a18026f72c621c7f5801f16f5c09dabdb05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2555803
Commit-Queue: Curt Clemens <cclem@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#830723}