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The |resolver_| is in the reader, so no need to pass it to a
closure carring the reader already. Also to align with other
places, OnScanRequestCompleted() has been made to be a member
method, so that |resolver_| can be cleared when settled.

Bug: 520391
Change-Id: Ie5718243aa0f60498e042550b33ffcea5700ad84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145262
Commit-Queue: Donna Wu <donna.wu@intel.com>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Cr-Commit-Position: refs/heads/master@{#758776}