Bug 1187110 part 5: re-enable mochitest test_extra_inherit_initial.html on b2g debug. (no review)

layout/style/test/mochitest.ini

@@ -153,7 +153,6 @@ skip-if = toolkit == 'android' #bug 536603
 [test_dynamic_change_causing_reflow.html]
 [test_exposed_prop_accessors.html]
 [test_extra_inherit_initial.html]
-skip-if = (toolkit == 'gonk' && debug) # Bug 1186224
 [test_flexbox_align_self_auto.html]
 [test_flexbox_child_display_values.xhtml]
 [test_flexbox_flex_grow_and_shrink.html]