Updating trunk VERSION from 3914.0 to 3915.0

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

Change-Id: Iec9a010782222ae75eff8aaf74a3a0e4eca6f86d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804325Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#696701}

chrome/VERSION

 MAJOR=79
 MINOR=0
-BUILD=3914
+BUILD=3915
 PATCH=0