Bug 1699464: Set GV content process count to 2 across all release channels; r=geckoview-reviewers,agi

I'm changing this to be unconditional so that it may ride the trains.

If we later decide that we need to hold it back for another release, we can
revert this in Beta.

I'm talking to data people about analyzing Fenix's tab retention probes. I'll
obviously be keeping an eye on those numbers as this change propagates.

Differential Revision: https://phabricator.services.mozilla.com/D114404

mobile/android/geckoview/src/main/java/org/mozilla/geckoview/GeckoRuntimeSettings.java

@@ -527,7 +527,7 @@ public final class GeckoRuntimeSettings extends RuntimeSettings {
     /* package */ final Pref<Boolean> mHttpsOnlyPrivateMode = new Pref<Boolean>(
         "dom.security.https_only_mode_pbm", false);
     /* package */ final Pref<Integer> mProcessCount = new Pref<>(
-            "dom.ipc.processCount", BuildConfig.RELEASE_OR_BETA ? 1 : 2);
+            "dom.ipc.processCount", 2);
 
     /* package */ int mPreferredColorScheme = COLOR_SCHEME_SYSTEM;