Updating trunk VERSION from 3602.0 to 3603.0

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

Change-Id: Ib690418ad7f66fab003f7ddc8ca44e33faa2ae2d
Reviewed-on: https://chromium-review.googlesource.com/c/1316599Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605243}

chrome/VERSION

 MAJOR=72
 MINOR=0
-BUILD=3602
+BUILD=3603
 PATCH=0