[WebNFC] Fix NullPointerException when reading unhandled records

This CL makes sure a NullPointerException is not fired when reading a
record that is not handled yet by Web NFC.

Bug: 520391
Change-Id: I3325816db121cd03829d9d414ae67343d716a37f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932787Reviewed-by: Leon Han <leon.han@intel.com>
Reviewed-by: Rijubrata Bhaumik <rijubrata.bhaumik@intel.com>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Auto-Submit: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#719043}

services/device/nfc/android/java/src/org/chromium/device/nfc/NdefMessageUtils.java

@@ -211,7 +211,9 @@ public final class NdefMessageUtils {
                         new String(ndefRecord.getType(), "UTF-8"), ndefRecord.getPayload());
                 break;
         }
+        if (record != null) {
             record.id = new String(ndefRecord.getId(), "UTF-8");
+        }
         return record;
     }