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This is part of an ongoing effort to simplify heap collections
and limit the types they can support (specifically, this CL
removes the only existing non-member usage of HeapDeque).

Bug: 1047147
Change-Id: I55995763db8c36d893a57a32ea04e38981917d36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013243
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739193}