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Continuous Bluetooth scan may cause scan results to accumulate.
This can result in large memory usage if there are other devices
advertising with randomized MAC addresses.
We limit the scan result cache to 1024 entries to prevent this situation.
We kick out the least recently used entry when limit is reached.

Bug: internal 116650055
Test: cast_bluetooth_unittests, manual.
Change-Id: Ife0161a6edbc4354133dc158d0901ddce6ef876a
Reviewed-on: https://chromium-review.googlesource.com/1255630
Commit-Queue: Tiansong Cui <tiansong@google.com>
Reviewed-by: Bailey Forrest <bcf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595692}