Updating trunk VERSION from 3937.0 to 3938.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=mmoss@chromium.org

Change-Id: I415a9d2f64f326797876998fd9bdd5f28c14b84f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1849132Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#704058}

chrome/VERSION

 MAJOR=79
 MINOR=0
-BUILD=3937
+BUILD=3938
 PATCH=0