Manually increment major version to 79.

Tbr: mmoss@chromium.org,govind@chromium.org,srinivassista@chromium.org
Bug: 1001786
Change-Id: Id0dceeca05d7da40f505dfbc13199bdf285bd637
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790748Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: Krishna Govind <govind@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>
Commit-Queue: Michael Moss <mmoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694595}

chrome/VERSION

-MAJOR=78
+MAJOR=79
 MINOR=0
 BUILD=3906
 PATCH=0