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Origins set to "clear on exit" need to get wiped when the storage
partition is shutting down. This was wired into the context's
destructor, but needed to be triggered earlier. Introduce an explicit
Shutdown() call invoked by the storage partition, similar to other
storage backends.

Bug: 750452, 824533
Change-Id: I353c183f842da0016fa35f7d48c462c5e85b67ab
Reviewed-on: https://chromium-review.googlesource.com/c/1289435Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607455}