Updating trunk VERSION from 4257.0 to 4258.0

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

Change-Id: I2fdfad924829f8853b75134e0b0502caa485d0a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2395075Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#804652}

chrome/VERSION

 MAJOR=87
 MINOR=0
-BUILD=4257
+BUILD=4258
 PATCH=0