In

 external/wpt/svg/geometry/svg-image-intrinsic-size-with-cssstyle-auto.html

an image could have finished loading before we attached the 'load'
handler to it, which would've cause the test to time out.

Wait for the window 'load' event instead (for all the images) to close
this race window.

Minor touch ups (var->const, < -> &lt;, indentation, trailing comma)
were applied as well.

Bug: 1364327
Change-Id: Ie1eb46d6d8bdb7b24d66293908555b3f7db417d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3900016


Auto-Submit: Fredrik Söderquist <fs@opera.com>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1048026}