Remove wpt/fetch/api/request/request-cache* expectations

They now pass.

Bug: 441781
Change-Id: I98dad704808c2ed810ff9d03e0e49200b8e90209
Reviewed-on: https://chromium-review.googlesource.com/762930
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515501}