Incrementing VERSION to 78.0.3904.9

TBR=govind@chromium.org

Change-Id: Ifb9aa5c8bcfe9d1a65c9146f3adeabdda339273d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797064
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/3904@{#57}
Cr-Branched-From: 675968a8c657a3bd9c1c2c20c5d2935577bbc5e6-refs/heads/master@{#693954}
1 file changed