Switch to standard integer types in third_party/zlib/google/.

BUG=138542
TBR=agl@chromium.org

Review URL: https://codereview.chromium.org/1552513002

Cr-Original-Commit-Position: refs/heads/master@{#366935}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7159e7ac95455689cd1075cd841ab449222ff74b