Updating trunk VERSION from 3728.0 to 3729.0

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

Change-Id: I7eb7a82223577ece936bed46e2c515377ff05a28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509233Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638663}

chrome/VERSION

 MAJOR=74
 MINOR=0
-BUILD=3728
+BUILD=3729
 PATCH=0