Incrementing VERSION to 68.0.3426.2

TBR=mmoss@chromium.org

Change-Id: Iaf1d72920f65059957e859a6f57039289e37878c
Reviewed-on: https://chromium-review.googlesource.com/1054450
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3426@{#5}
Cr-Branched-From: 2a324b4c3ab068ca99b5dead0b2a336a4776befb-refs/heads/master@{#557428}
1 file changed