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gchatz authored
The structure of the pref that stores NTP Promos changed when support was added for storing multiple NTP Promos. This CL adds code to handle migrating the data from the old structure to the new structure, so that there is no data loss when users upgrade. BUG=620554 Review-Url: https://codereview.chromium.org/2094523002 Cr-Commit-Position: refs/heads/master@{#402356}
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