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Minor change on custom link edit input label and text field background
color css setting according to GM2 webUI spec.

Bug: 873721
Change-Id: I6770ce6eedf4a4e5ec6cb273e34136d30ee17f58
Reviewed-on: https://chromium-review.googlesource.com/1174870Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583001}