Updating trunk VERSION from 3949.0 to 3950.0

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

Change-Id: Iec3984d64b4c0421ff25b5759f5fa21bc4102efa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877910Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#708895}

chrome/VERSION

 MAJOR=80
 MINOR=0
-BUILD=3949
+BUILD=3950
 PATCH=0