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Updates fonts, spaces, colors in omnibox-related code to match the new
specs.

Bug: 852787
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ibe22b985011ce7ed3da9f83291f293e3942728c4
Reviewed-on: https://chromium-review.googlesource.com/1101026Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568693}