Remove pointerlock/pointerevent_pointermove_in_pointerlock.html.ini

We do not need WPT test expectation files for WPT tests except
the infrastructure tests, so we should remove
third_party/blink/web_tests/external/wpt/pointerevents/
pointerlock/pointerevent_pointermove_in_pointerlock.html.ini.

Bug: 1086154
Change-Id: Ie964d783cdf4cd5754de7df0e7262cf5fc3e4696
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2418975
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Reviewed-by: Liviu Tinta <liviutinta@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808482}

third_party/blink/web_tests/external/wpt/pointerevents/pointerlock/pointerevent_pointermove_in_pointerlock.html.ini

-[pointerevent_pointermove_in_pointerlock.html]
-  expected:
-    if product == "firefox": ERROR