Bug 1669532 - Pref on webgl.out-of-process for Lin nightly/dev. r=lsalzman

Differential Revision: https://phabricator.services.mozilla.com/D92643

modules/libpref/init/StaticPrefList.yaml

@@ -9988,7 +9988,7 @@
 
 - name: webgl.out-of-process
   type: RelaxedAtomicBool
-#if defined(XP_MACOSX) || defined(XP_WIN)
+#if (defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID)) || defined(XP_MACOSX) || defined(XP_WIN)
   value: @IS_NIGHTLY_OR_DEV_EDITION@
 #else
   value: false