Updating trunk VERSION from 4251.0 to 4252.0

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

Change-Id: I42c87d7ed13b1a9a3ec11ae5bca50c8b0c0cc381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387344Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#803369}

chrome/VERSION

 MAJOR=87
 MINOR=0
-BUILD=4251
+BUILD=4252
 PATCH=0