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This reverts commit 314e453b.

Reason for revert: HoldingSpaceTrayTest.ShowTrayButtonOnFirstUse is crashing on linux-chromeos-dbg:
https://ci.chromium.org/p/chromium/builders/ci/linux-chromeos-dbg/21023


Original change's description:
> Introduce partially initialized holding space items
>
> Introduces a concept of partially initialized HoldingSpaceItem - this
> state will be used when loading items from persistent storage in case
> the item file system URL cannot immediately be resolved (e.g. if the
> associated mount point hasn't been loaded yet).
> HoldingSpacePersistenceDelegate will deserialize persisted items into
> partial state when they are first loaded from the storage, and
> "finalize" them when their file system URL can be resolved.
>
> Compared to an alternative approach where items whose initialization has
> to be deferred, this approach keeps the order in which items are added
> to the model.
>
> Updates holding space UI not to show partially initialized items.
>
> BUG=1140150
>
> Change-Id: Ie19997ec02f6323434f4053f6ba41a2998e72efa
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493323
> Commit-Queue: Toni Baržić <tbarzic@chromium.org>
> Reviewed-by: David Black <dmblack@google.com>
> Cr-Commit-Position: refs/heads/master@{#821024}

TBR=tbarzic@chromium.org,dmblack@google.com

Change-Id: Ie916d1b4f15eab360b7124c481105733736c671c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1140150
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2500688Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Kunihiko Sakamoto <ksakamoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821111}