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This CL uses AbortController to replace the stop() method of NFCReader
interface.

The corresponding spec change is from:
https://github.com/w3c/web-nfc/pull/300

BUG=520391

Change-Id: Ia28bfb283a7ad66fb9c4cb0fc744582671a62fa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769245Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Commit-Queue: Leon Han <leon.han@intel.com>
Cr-Commit-Position: refs/heads/master@{#691988}