Incrementing VERSION to 65.0.3325.21

TBR=dimu@chromium.org

Change-Id: Ifad61ab729a7f93913e0a668ef53a994aa723c1c
Reviewed-on: https://chromium-review.googlesource.com/885302
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3325@{#85}
Cr-Branched-From: bc084a8-refs/heads/master@{#530369}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=65
 MINOR=0
 BUILD=3325
-PATCH=20
+PATCH=21