Incrementing VERSION to 90.0.4430.7

TBR=govind@chromium.org

Change-Id: I55f794f604a4ec5eae07f3b200dd12519f15f052
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2726362
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/4430@{#18}
Cr-Branched-From: e5ce7dc-refs/heads/master@{#857950}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=90
 MINOR=0
 BUILD=4430
-PATCH=6
+PATCH=7