Cache Storage API: Hook up to chrome://settings/cookies

Expose each origin's usage (bytes, last modified) of the Service
Worker Cache Storage API in the cookie tree UI and allow
privacy-concerned individuals to nuke it from orbit.

BUG=466371

Committed: https://crrev.com/4c354468b01a2389a886ce21d1869582ac20cbe8
Cr-Commit-Position: refs/heads/master@{#344891}

Review URL: https://codereview.chromium.org/1297093002

Cr-Commit-Position: refs/heads/master@{#344944}
44 files changed