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This reverts commit 5aa92900.

Reason for revert: Suspicious of introducing a heap use after free.

Original change's description:
> Rough in support for multiple selection in holding space.
> 
> Holding space needs to support selection of multiple holding space items
> to perform bulk context menu and drag/drop operations on them at a time.
> 
> This CL refactors HoldingSpaceItemContextMenu into a shared
> HoldingSpaceItemViewDelegate to facilitate these requirements.
> 
> Note that this CL does not change any existing behavior, just lays the
> groundwork for supporting multiple selection.
> 
> Bug: 1129981
> Change-Id: If4da6c19ba01bd7104a1b1487350c362d7be1dd4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419136
> Commit-Queue: David Black <dmblack@google.com>
> Reviewed-by: Ahmed Mehfooz <amehfooz@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#809625}

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

Change-Id: I6c0ea6374b87d7d2f673f80e97781b1036604a14
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1129981,1131382
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425048Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Tim Schumann <tschumann@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809721}