Point //ios/web_view to prod sync servers.

version_info::Channel must be set to Stable. See:
https://cs.chromium.org/chromium/src/components/sync/driver/sync_util.cc?q=sync_util.cc&sq=package:chromium&dr&l=85

Change-Id: I4c63e65bb866d19d77e5fc80ebc2fb1259b216b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1510763
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638927}
3 files changed