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So these tasks have been queueing with different path names than
those used by the template processor. The latter uses "Unix name"
equivalents of the API features, while the former was not.

For example, "apps/appviewTag" has been caching as such but the
template looks for "apps/appview_tag". It's unclear when this
incongruity appeared but it explains several "my-docs-arent-updating"
bugs that have appeared in the past several weeks.

This changes the refresh servlet to queue API refresh tasks using
API features in unix_name form, resolving the incongruity.

BUG=471019
TBR=kalman@chromium.org

Review URL: https://codereview.chromium.org/1038993002

Cr-Commit-Position: refs/heads/master@{#322496}