Bug 1516441 - Skip dom/media/tests/mochitest/identity on android; r=bc

These tests were already skipped on the Android 4.3 emulator and started
failing on hardware when host-utils were updated to 66.0a.

dom/media/tests/mochitest/identity/mochitest.ini

@@ -1,7 +1,7 @@
 [DEFAULT]
 # Android 4.3 - bug 981881
 subsuite = media
-skip-if = android_version == '18' || (os == 'linux' && !debug && !e10s)
+skip-if = (toolkit == 'android') || (os == 'linux' && !debug && !e10s)
 support-files =
   /.well-known/idp-proxy/idp.js
   identityPcTest.js