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This CL just renames NFCWatchOptions to NFCReaderOptions according to
the new spec definition, in preparation for the next step to implement
NFCReader Javascript interface.
http://w3c.github.io/web-nfc/#dom-nfcreaderoptions

The spec change:
https://github.com/w3c/web-nfc/commit/023d6c39f2ccd4dfd1541c259e7810a2b03af762

BUG=520391

Change-Id: I9614c5075c98334a9e573972666c6bd942bd1392
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1638934
Commit-Queue: Leon Han <leon.han@intel.com>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666622}