FSA: Fix more manual WPTs
Two tests were using await in a non-async function. And a test helper
was using newAnonymousIframe which was updated at some point to
newIframeCredentialless.
Bug: 346991169
Change-Id: I4333b6abee03ed48cf0d10d3417a2c15fba06d30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5906718
Commit-Queue: Nathan Memmott memmott@chromium.org
Reviewed-by: Ayu Ishii ayui@chromium.org
Cr-Commit-Position: refs/heads/main@{#1363384}