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This CL fixes a retain cycle that was caused by using an ivar in an
asynchronous block. The block retains self when an ivar is used.
This CL also more broadly replaces ivars with properties in the same
file.

Bug: 918032
Change-Id: I26c867931ad96574f19420f58465e2d14c43ce43
Reviewed-on: https://chromium-review.googlesource.com/c/1393015Reviewed-by: Eric Noyau <noyau@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619922}