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Use URL validation provided by GURL, and added URL formatting using
FixupURL. This tries to make "smart" adjustments to obviously invalid
input (see url_fixer.h). The fixed URL will default to "https://" if a
scheme was not specified.

Also disabled spellcheck in the URL field and removed "required" from
the Name field. The URL will be set as the title if Name is left empty.

Bug: 874194
Change-Id: I0d40f551f3e79d77aa93ce3dd0f36f736bf987ee
Reviewed-on: https://chromium-review.googlesource.com/1182418
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586024}