Remove crc_folding.c from google.patch

The recent change to crc_folding.c was added to google.patch but this
was inappropriate because crc_folding.c is not part of the original zlib
distribution. This was noticed by scottmg@

R=gavinp@chromium.org
BUG=440500

Review URL: https://codereview.chromium.org/1397813003

Cr-Original-Commit-Position: refs/heads/master@{#353760}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 93a8d6c6a00e690fc4fcdc55d016d0ac8c6fab7c