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With DCHECKs enabled, GetStorageKey() might potentially fail in some
codepaths that are updated in this patch.

In addition, we introduce a CHECK for a scenario that is subject to
investigation.

Bug: 837517
Change-Id: I903f83e8ed7ca96aa525c0640aa9ffc629fc5721
Reviewed-on: https://chromium-review.googlesource.com/1042393Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555734}