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Some notable points:

1) Local type in WebNFC APIs is always prefixed by ':', but, the ':'
   will be omitted when it's actually written into the nfc tag.
     ":act"  --> "act" to be written as the TYPE field into the nfc tag.
     ":text" --> "text"
   The reading direction is vice versa.
     "act"  --> ":act" to be exposed as NDEFRecord#recordType.
     "text" --> ":text"

2) Only "smart-poster", external, and local type records are supposed to
   be able to carry a ndef message as payload.

3) Local type is only expected to exist inside a ndef message that is
   another ndef record's payload. Top level ndef message is not allowed
   to have a local type record.

The spec changes:
https://github.com/w3c/web-nfc/pull/491
https://github.com/w3c/web-nfc/pull/493
https://github.com/w3c/web-nfc/pull/495
https://github.com/w3c/web-nfc/pull/502
https://github.com/w3c/web-nfc/pull/506

BUG=520391

Change-Id: Ic2890c031109aa583437ac93a8901ff71992af78
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1996946Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Leon Han <leon.han@intel.com>
Cr-Commit-Position: refs/heads/master@{#737290}