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The chrome-search://ntpicon source will always return an image
that is 40dp: either the local favicon (16dp) drawn in the middle
of a circle, or a fallback letter in a circle.

This simplifies the css and addresses a potential privacy concern.

Bug: 853780
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I1eccb79f79ce03434e5af78b48a4ae1ed6fe836f
Reviewed-on: https://chromium-review.googlesource.com/1111912Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Mathieu Perreault <mathp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569768}