Minor fixing to WPT css/css-fonts/fallback-remote-to-data-url.html

1. The font style is also applied to element non-target so that we can
   verify the effect of unicode-range on data-font

2. Added 'font-display: swap' to remote-font so that we can observe the
   fallback when loading remote-font

Bug: 897539
Change-Id: I9bbe0705bc7d3a9ebbaf92f2c8c26c557adec24a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3069529


Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Auto-Submit: Xiaocheng Hu <xiaochengh@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#908594}