Incrementing VERSION to 90.0.4427.7

TBR=pbommana@chromium.org

Change-Id: I2b3b2fe38b1ae391335cc53b533bfa82633cc35f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2720521
Reviewed-by: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Chrome Release Bot (LUCI) <chrome-official-brancher@chops-service-accounts.iam.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4427@{#16}
Cr-Branched-From: ce035c6-refs/heads/master@{#856944}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=90
 MINOR=0
 BUILD=4427
-PATCH=6
+PATCH=7