Updating trunk VERSION from 3456.0 to 3457.0

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

Change-Id: I9b1371d303248dd7f4cd2f201a6be7869574b897
Reviewed-on: https://chromium-review.googlesource.com/1096603Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566394}

chrome/VERSION

 MAJOR=69
 MINOR=0
-BUILD=3456
+BUILD=3457
 PATCH=0