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Cast is not respnsible for uploading crash dumps on Fuchsia, so
app_state_tracker needs to work with different annotation storing
backends.

Bug: b/67907746
Test: Build
Change-Id: I5cd6a13f9e642cdbf940cc8ada5dd76663e793e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083956
Commit-Queue: Christopher Whelan <chwhelan@google.com>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749388}