Bug 1500046 - re-enable test; r=daisuke

Depends on D10048

Differential Revision: https://phabricator.services.mozilla.com/D10211

--HG--
extra : moz-landing-system : lando

devtools/client/inspector/animation/test/browser.ini

@@ -71,7 +71,6 @@ skip-if = (os == "win" && ccov) # Bug 1490981
 [browser_animation_logic_mutations.js]
 [browser_animation_logic_mutations_add_remove_immediately.js]
 [browser_animation_logic_mutations_fast.js]
-skip-if= true # Bug 1500046
 [browser_animation_logic_mutations_properties.js]
 [browser_animation_logic_overflowed_delay_end-delay.js]
 skip-if = debug #bug 1480027