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This is the new syntax agreed for partmap.

Bug: 805271
Change-Id: I5e8e34551167b4a56706980dae8054e4b7a6fba2
Reviewed-on: https://chromium-review.googlesource.com/c/1278566
Commit-Queue: Fergal Daly <fergal@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599142}