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We've changed the proto field used to record structured metrics, this
CL changes the metrics provider from using deprecated_structured_event
to using structured_data.events.

Bug: 1148168
Change-Id: I9b987c2e24886ee72b2f404dcd713981674cc194
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636079Reviewed-by: Rachel Wong <wrong@chromium.org>
Commit-Queue: Tony Yeoman <tby@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844657}