[Linux] Webview Tag background is not rendered on Huffingtonpost.com

Found by Evergreen.
Reproducible: always
Platform-specific: yes, newer Ubuntu
Regression: no
Steps to reproduce:
1. Open http://www.huffingtonpost.com/?country=US in Chrome/Chromium and in WebView.
2. Look at tags under articles (More politics, More green, etc)
Expected result (as in browser): Tag is rendered and visible.
Actual result: only arrow of the tag is visible, can't see tag title.