Updating trunk VERSION from 3687.0 to 3688.0

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

Change-Id: I0d88d0749b739abf3db573dfc36ec3035765403e
Reviewed-on: https://chromium-review.googlesource.com/c/1441797Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626886}

chrome/VERSION

 MAJOR=74
 MINOR=0
-BUILD=3687
+BUILD=3688
 PATCH=0