Bug 1551718 - Disable perma-failing webreplay tests; r=jdescottes

When webreplay tests are enabled, there are now 3 perma-failing tests:
https://treeherder.mozilla.org/#/jobs?repo=try&tier=1%2C2%2C3&revision=74dff9ebd140f837636613efeecb2590b2645a98
We can skip those tests so the task passes:
https://treeherder.mozilla.org/#/jobs?repo=try&tier=1%2C2%2C3&revision=8a9d36feb19ec5139a4b4beb131ac69a3c814209

Differential Revision: https://phabricator.services.mozilla.com/D31469

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

devtools/client/webreplay/mochitest/browser.ini

@@ -38,8 +38,11 @@ skip-if = true # See bug 1481009
 [browser_dbg_rr_replay-02.js]
 [browser_dbg_rr_replay-03.js]
 [browser_dbg_rr_console_warp-01.js]
+skip-if = true
 [browser_dbg_rr_console_warp-02.js]
+skip-if = true
 [browser_dbg_rr_logpoint-01.js]
+skip-if = true
 [browser_dbg_rr_logpoint-02.js]
 [browser_rr_inspector-01.js]
 [browser_rr_inspector-02.js]