Very small cleanup

This just removes an extra `new` in a few places. This:

  `await new test_driver.send_keys`

becomes this:

  `await test_driver.send_keys`

The test_driver.send_keys function does not use `this`,
so `new` is not needed:

https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/external/wpt/resources/testdriver.js;l=71;drc=5dc84ea15257674d6cf48920576a293557e53069

Change-Id: Ie21c96d8d05c74f97de49b116df5f045ed3e03c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6266169
Reviewed-by: Di Zhang <dizhangg@chromium.org>
Commit-Queue: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1422261}