Updating trunk VERSION from 4305.0 to 4306.0

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

Change-Id: I77d4b8545a7d47ada444bc4660610250c7550c2a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500705Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#821051}

chrome/VERSION

 MAJOR=88
 MINOR=0
-BUILD=4305
+BUILD=4306
 PATCH=0