Updating trunk VERSION from 4260.0 to 4261.0

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

Change-Id: Iba02761d0858ff1087f77809e3e15ff6d9e881c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402193Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#805603}

chrome/VERSION

 MAJOR=87
 MINOR=0
-BUILD=4260
+BUILD=4261
 PATCH=0