Updating trunk VERSION from 4126.0 to 4127.0

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

Change-Id: I249b2b4e895d7a8f6d94e34fad95a778f2caaaf6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2166612Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#762632}

chrome/VERSION

 MAJOR=84
 MINOR=0
-BUILD=4126
+BUILD=4127
 PATCH=0