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so that all provider subclasses can have their state verified.

Committed: https://crrev.com/bce10d97d6fc5233071427cf622aaad7abde9e19
Cr-Commit-Position: refs/heads/master@{#328154}

Committed: https://crrev.com/269875cf0d23881a7ad119bae730ff54fdd4dd0b
Cr-Commit-Position: refs/heads/master@{#328351}

Committed: https://crrev.com/d833a674a5e4f3b4e47f229b3d5411a8d509c2c0
Cr-Commit-Position: refs/heads/master@{#328909}

Committed: https://crrev.com/1d6f67fe72b4a9ae94fcb0a6e051d803a180bde1
Cr-Commit-Position: refs/heads/master@{#329003}

Review URL: https://codereview.chromium.org/1114383003

Cr-Commit-Position: refs/heads/master@{#330139}