[libFuzzer] remove unnecessary json.proto copy

This copy was introduced in
https://chromium-review.googlesource.com/c/chromium/src/+/746990/

But seems not necessary, can we remove this?

Bug: 938011
Change-Id: Ie32bd7737abd1353f33fb4a52068539af4d06731
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1504481
Commit-Queue: Max Moroz <mmoroz@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638110}
1 file changed