Updating trunk VERSION from 4183.0 to 4184.0 and incrementing major version to 86

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

Change-Id: Icba1fd57c71ce85b0318719d4265de96ff5406dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269777Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#782826}

chrome/MAJOR_BRANCH_DATE

-MAJOR_BRANCH_DATE=2020-05-15
+MAJOR_BRANCH_DATE=2020-06-26

chrome/VERSION

-MAJOR=85
+MAJOR=86
 MINOR=0
-BUILD=4183
+BUILD=4184
 PATCH=0