Updating trunk VERSION from 4814.0 to 4815.0

* This is an automated release commit.
* Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true

Change-Id: Ie70b25b67589d2490789c2546e18ae36f9eaf46e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3373178
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#956797}