Updating trunk VERSION from 3727.0 to 3728.0

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

Change-Id: I57c94f248bf2db118e94903f6861c81289b07f5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1507013Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638418}

chrome/VERSION

 MAJOR=74
 MINOR=0
-BUILD=3727
+BUILD=3728
 PATCH=0