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This version has been obsolete for longer than the 2 year deprecation window.
Maintaining backwards support for this would greatly complicate schema migration
and recovery in the transition to schema version 8, which adds support for
tracking the last_requested time of a given icon bitmap.

BUG=467712

Review URL: https://codereview.chromium.org/1010973011

Cr-Commit-Position: refs/heads/master@{#322151}