Bug 1672285: Set browser.tabs.remote.autostart = true in geckoview-prefs; r=geckoview-reviewers,agi

We used to do this as part of requesting multiprocess in runtime settings, but
now that e10s is default, we need to set it here.

Differential Revision: https://phabricator.services.mozilla.com/D94207

mobile/android/app/geckoview-prefs.js

@@ -17,6 +17,7 @@
 
 pref("privacy.trackingprotection.pbmode.enabled", false);
 
+pref("browser.tabs.remote.autostart", true);
 pref("dom.ipc.keepProcessesAlive.web", 1);
 pref("dom.ipc.processCount", 1);
 pref("dom.ipc.processPrelaunch.enabled", false);