Bug 1107706: Part 10: Disable test_anonymous_content.py on B2G

It uses chrome context to test XUL related functionality that is not
necessary nor desirable to run on B2G.

--HG--
extra : rebase_source : bb82f0bd89d782b1427a872524a7c4fd0e0cdc66
extra : source : e3ddaf8aae394231f40db79ba38d7bd8e19f2d8c

testing/marionette/client/marionette/tests/unit/unit-tests.ini

@@ -96,6 +96,7 @@ browser = false
 [test_simpletest_timeout.js]
 [test_specialpowers.py]
 [test_anonymous_content.py]
+b2g = false
 [test_switch_frame.py]
 b2g = false
 skip-if = os == "win" # Bug 1078237