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Removing the items from the container one by one is inefficient, and at
shutting down, this can be done by emptying the container directly.

Bug: 1112835
Change-Id: Ib7529963763b1e772b6ba330eda3a3a3e2f6d380
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2340319Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Jun Liu <yjliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796153}