Incrementing VERSION to 61.0.3163.8

TBR=dimu@chromium.org

Change-Id: Ica643e264a7fb6be736758a0278acac8af9bf38b
Reviewed-on: https://chromium-review.googlesource.com/582394
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3163@{#8}
Cr-Branched-From: ff259ba-refs/heads/master@{#488528}

chrome/VERSION

@@ -1,4 +1,4 @@
 MAJOR=61
 MINOR=0
 BUILD=3163
-PATCH=7
+PATCH=8