Bug 1227515 - Avoid displaying the e10s offer notification when running browser chrome tests. r=felipe

--HG--
extra : commitid : DkqvfwzF4ox

testing/profiles/prefs_general.js

@@ -308,6 +308,7 @@ user_pref("media.decoder.heuristic.dormant.timeout", 0);
 #endif
 
 // Don't prompt about e10s
+user_pref("browser.displayedE10SNotice", 5);
 user_pref("browser.displayedE10SPrompt.1", 5);
 // Don't use auto-enabled e10s
 user_pref("browser.tabs.remote.autostart.1", false);