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This interface is unused within CallStackProfileBuilder. The equivalent
functionality will be supported eventually within the class but will
occur via the metadata mechanism.

Bug: 851163
Change-Id: I3bd8430de70c973c3e4a293118403312b977f8d1
Reviewed-on: https://chromium-review.googlesource.com/c/1351533Reviewed-by: Xi Cheng <chengx@chromium.org>
Commit-Queue: Mike Wittman <wittman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611935}