Updating trunk VERSION from 3501.0 to 3502.0

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

Change-Id: I896d5cd0bdc2f76cc139717c2d8d4b625e46039c
Reviewed-on: https://chromium-review.googlesource.com/1147710Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577417}

chrome/VERSION

 MAJOR=70
 MINOR=0
-BUILD=3501
+BUILD=3502
 PATCH=0