Bug 1714655 - Enable reftests for Android with Fission r=emilio,layout-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D204829

layout/tools/reftest/mach_commands.py

@@ -160,10 +160,6 @@ class ReftestRunner(MozbuildObject):
             args.e10s = False
             print("using e10s=False for non-geckoview app")
 
-        # Disable fission until geckoview supports fission by default.
-        # Need fission on Android? Use '--setpref fission.autostart=true'
-        args.disableFission = True
-
         # A symlink and some path manipulations are required so that test
         # manifests can be found both locally and remotely (via a url)
         # using the same relative path.