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This CL cleans up old mojo types for mojom::BlobURLStore
using SelfOwnedAssociatedReceiverRef instead of
StrongAssociatedBindingPtr.

Bug: 955171
Change-Id: I5069e33e5397da53cee6138ad070de1d5bc54619
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1886550Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#710568}