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No need to call the destructor anywhere, and this is also dangerous in
principle, since raw pointers to the partitions are captured and used
everywhere in blink.

Change-Id: I84f62502003ac2bb3da6d1c48e6e28f7e8c81fb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607312Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840193}