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In August 2016 browser migrated from old schema to a new one, this patch
removes the migration code as most active installations probably already
migrated.

Bug: 1028127
Change-Id: I586fa49422daef12c7a27b4b32fddc40cc0651a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144186Reviewed-by: Christos Froussios <cfroussios@chromium.org>
Commit-Queue: Christos Froussios <cfroussios@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758822}