Updating trunk VERSION from 3515.0 to 3516.0

# This is an automated release commit.
# Do not revert without consulting chrome-pmo@google.com.
NOAUTOREVERT=true
TBR=mmoss@chromium.org

Change-Id: I6cdc3d01c4082cca740b9e00e36664cd89146ff3
Reviewed-on: https://chromium-review.googlesource.com/1164643Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581111}

chrome/VERSION

 MAJOR=70
 MINOR=0
-BUILD=3515
+BUILD=3516
 PATCH=0