Add web-nfc mojom.js files to mojojs.zip

These files need to be accessible when running wpt
outside chromium environment.

see: https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_platform_tests.md#mojojs

This is the first step towards making these tests pass outside the Chromium CI

Bug: 1123988
Change-Id: Ie151810cdd55e474857670e092a8e036923a8e30
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390202Reviewed-by: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Reviewed-by: Michael Moss <mmoss@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Arnaud Mandy <arnaud.mandy@intel.com>
Cr-Commit-Position: refs/heads/master@{#804132}

chrome/tools/build/linux/FILES.cfg

@@ -412,4 +412,10 @@ FILES = [
     'buildtype': ['dev', 'official'],
     'archive': 'mojojs.zip',
   },
+  # MojoJS support data (WebNFC):
+  {
+    'filename': 'gen/services/device/public/mojom/nfc.mojom.js',
+    'buildtype': ['dev', 'official'],
+    'archive': 'mojojs.zip',
+  },
 ]