Incrementing VERSION to 66.0.3359.8

TBR=dimu@chromium.org

Change-Id: Ica075166dde668c0fa2027e1653df619010969d1
Reviewed-on: https://chromium-review.googlesource.com/947774
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3359@{#8}
Cr-Branched-From: 66afc5e-refs/heads/master@{#540276}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=66
 MINOR=0
 BUILD=3359
-PATCH=7
+PATCH=8