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Change Font Family to Segoe UI for custom link when
using Windows and make it bolder for fallback icon letter.

Before:
https://screenshot.googleplex.com/pRPVmEC3yc8.png
After:
https://screenshot.googleplex.com/m16uEv78QBp.png

Bug: 867778
Change-Id: I1f16dbf044cad7504617868f131b7517985cd2c2
Reviewed-on: https://chromium-review.googlesource.com/1178469
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Kristi Park <kristipark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586357}