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This reverts commit 93682cb5.

Reason for revert: The feature crashes on Windows -- https://crbug.com/1052041

Original change's description:
> AppCache: Enable correct 304 handling by default.
> 
> We'll monitor the fix as it goes through the Chrome release waterfall,
> instead of doing a Finch-based trial. This frees us from having to
> reason about enterprises that may disable Finch.
> 
> Bug: 989611
> Change-Id: I50389c12d31f63fa6257d879f3d840ffde2cb27e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2052245
> Commit-Queue: Victor Costan <pwnall@chromium.org>
> Commit-Queue: Chase Phillips <cmp@chromium.org>
> Auto-Submit: Victor Costan <pwnall@chromium.org>
> Reviewed-by: Chase Phillips <cmp@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#740894}

TBR=cmp@chromium.org,pwnall@chromium.org

Change-Id: Ieeb9be42038ba56e176b0ba6a7ab0c84629fea1c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 989611
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2055007Reviewed-by: Victor Costan <pwnall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741154}