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Decoupling the two helps when displaying a blue favicon (such as
Facebook) under the loading-progress indicator. Similar concerns apply
in incognito over grey favicons. There are possibly similar concerns
when using themes.

This change also decouples favicon placeholder roundrect radius from
throbber since they are no longer overlapping eachother.

Bug: chromium:906605
Change-Id: Ie1959d0d447851f3cac3430e3d31b3b989bed263
Reviewed-on: https://chromium-review.googlesource.com/c/1341527Reviewed-by: Edward Jung <edwardjung@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609289}