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Following Web NFC spec change at https://github.com/w3c/web-nfc/pull/303,
this CL makes sure NFC is not suspended when frame loses focus.

http://crrev.com/c/1862475 added a focused test but it wasn't working.
Later http://crrev.com/c/186439 fixed it and added a timeout test expectation.
This CL removes it as focus is not a requirement anymore.

Bug: 996250, 520391
Change-Id: I6b5d14796dc00c8d3c8634dd9caac6da337df10d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764132
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708182}