As per spec https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet,
the <link> element can have its load and error events fire multiple times,
per resource it loads.
Bug: 922618
Change-Id: Ifc9ade076e119d5cf9f4eaf656c6ea7c1deb0ba9
Reviewed-on: https://chromium-review.googlesource.com/c/1423601
Reviewed-by: Kouhei Ueno <[email protected]>
Reviewed-by: Yutaka Hirano <[email protected]>
Commit-Queue: Dominic Farolino <[email protected]>
Cr-Commit-Position: refs/heads/master@{#628010}