GitLab

Wait for the fetch to complete before checking whether xhr request was
seen by the browser. This should hopefully fix the flakiness since page
load won't necessarily wait for the fetch to complete.

BUG=1050536, 1056031

Change-Id: I9c043d69c4d619e00737303d2aaa3c15dc587ae2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076658
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744926}