Updating trunk VERSION from 4086.0 to 4087.0

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

Change-Id: I215d45b0f382bb0ae99350dd8d0ec8770a10e8f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2104512Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#750464}

chrome/VERSION

 MAJOR=83
 MINOR=0
-BUILD=4086
+BUILD=4087
 PATCH=0