Updating trunk VERSION from 4451.0 to 4452.0

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

Change-Id: I0ed39bb34f0010f4e79031c8aa311ca7a77dc814
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2773521
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#864545}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=91
 MINOR=0
-BUILD=4451
+BUILD=4452
 PATCH=0