Bug 993802 - Re-enable browser_save_private_link_perwindowpb.js on Linux which bug 987404 accidentally re-disabled. r=markh

browser/base/content/test/general/browser.ini

@@ -355,7 +355,7 @@ skip-if = true  # disabled until the tree view is added
 [browser_save_link-perwindowpb.js]
 skip-if = e10s # Bug ?????? - test directly manipulates content (event.target)
 [browser_save_private_link_perwindowpb.js]
-skip-if = os == "linux" || e10s # Linux: bug 857427; e10s: Bug 933103 - mochitest's EventUtils.synthesizeMouse functions not e10s friendly
+skip-if = e10s # e10s: Bug 933103 - mochitest's EventUtils.synthesizeMouse functions not e10s friendly
 [browser_save_video.js]
 skip-if = e10s # Bug ?????? - test directly manipulates content (event.target)
 [browser_scope.js]