Updating trunk VERSION from 3599.0 to 3600.0

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

Change-Id: Id8d03ff031991eeea8a2d4069332adb17b6ae869
Reviewed-on: https://chromium-review.googlesource.com/c/1314148Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604829}

chrome/VERSION

 MAJOR=72
 MINOR=0
-BUILD=3599
+BUILD=3600
 PATCH=0