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BlueZ bug makes it wrong to assume that the Discovering property is
updated when StartDiscovery/StopDiscovery returns (crbug.com/822104).
BlueZ bug fixing is deprioritized so here we remove the DCHECK first
until BlueZ bug is fixed.

BUG=814595
TEST=No longer crashes

Change-Id: I12c6d0df808553d3098525b70ab998d8c957b918
Reviewed-on: https://chromium-review.googlesource.com/963845Reviewed-by: Miao-chen Chou <mcchou@chromium.org>
Commit-Queue: Sonny Sasaka <sonnysasaka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543495}