Bug 1547961 - [remote] Unskip browser_runtime_executionContext.js on Mac and Windows. r=remote-protocol-reviewers,ato

Differential Revision: https://phabricator.services.mozilla.com/D48161

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

remote/test/browser/browser.ini

@@ -27,7 +27,6 @@ support-files =
 [browser_runtime_callFunctionOn.js]
 [browser_runtime_evaluate.js]
 [browser_runtime_executionContext.js]
-skip-if = os == "mac" || (verify && os == 'win') # bug 1547961
 [browser_runtime_get_properties.js]
 [browser_runtime_remote_objects.js]
 [browser_session.js]