Removing old prefs storage for BudgetManager
Originally, the BudgetManager stored the budget for an origin in the
prefs in kBacgkroundBudgetMap. As the data stored became more complicated,
it switched to using the BudgetDatabase, which is a LevelDB wrapper. The
prefs storage mechanism was deprecated in Chrome 56 and code added to
cleanup any stored data there.
Now that Chrome 57 has branched, we can remove the cleanup code and any
remaining prefs artifacts.
BUG=617971
Review-Url: https://codereview.chromium.org/2682073002
Cr-Commit-Position: refs/heads/master@{#449035}
5 files changed
