Bug 1586411 - Reenable netwerk/test/mochitests/test_different_domain_in_hierarchy.html in fission r=mattwoodrow

Differential Revision: https://phabricator.services.mozilla.com/D56795

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

netwerk/test/mochitests/mochitest.ini

@@ -82,7 +82,6 @@ support-files = sw_1502055.js file_1502055.sjs iframe_1502055.html
 [test_accept_header.html]
 support-files = test_accept_header.sjs
 [test_different_domain_in_hierarchy.html]
-skip-if = (fission && os == "linux") #crash @ mozilla::dom::BrowserBridgeParent::RecvShow(mozilla::gfx::IntSizeTyped<mozilla::ScreenPixel> const&, bool const&, nsSizeMode const&)
 [test_differentdomain.html]
 [test_image.html]
 [test_loadflags.html]