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This reverts commit 9f54bb86.

Reason for revert: https://bugs.chromium.org/p/chromium/issues/detail?id=1114308

Original change's description:
> [Media Router] Add AppAvailability Logs
> 
> This CL adds a mojo::Remote<mojom::Logger> in CastAppDiscoveryService to
> log unavailable (app_id, sink_id) pairs and socket not found errors.
> 
> Bug: 687380, b/154273698
> Change-Id: Ib50c74cd9a0e66c9c05b3f36fdf653e2565d8048
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2332329
> Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
> Commit-Queue: Muyao Xu <muyaoxu@google.com>
> Cr-Commit-Position: refs/heads/master@{#795981}

TBR=takumif@chromium.org,muyaoxu@google.com

Change-Id: I28d8206ee3b243ff82d210d561869e7eb4dc04e1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 687380
Bug: b/154273698
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343764Reviewed-by: Roberto Carrillo <robertocn@chromium.org>
Commit-Queue: Roberto Carrillo <robertocn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796102}