Incrementing VERSION to 70.0.3538.6

TBR=govind@chromium.org

Change-Id: I8976a820a648bf9ead43d0b4bde439a477ee34e3
Reviewed-on: https://chromium-review.googlesource.com/1203433
Reviewed-by: chrome-release-bot@chromium.org <chrome-release-bot@chromium.org>
Cr-Commit-Position: refs/branch-heads/3538@{#15}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
1 file changed