Remove check in ThreadableLoader::ResponseReceived

The check deleted is now not needed because the service worker added
their own checks. And rules of memory cache and preload matching are
more strict today.


Bug: 1053866
Change-Id: I691c407115f85548389a53cb7d464420b6d8d018
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3115027


Reviewed-by: Kenichi Ishibashi <bashi@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Ai Nozaki <ainozaki@google.com>
Cr-Commit-Position: refs/heads/main@{#915101}