Turn back spoken feedback setting into a system-wide (non-per-user) preference

chrome/test/data/policy/policy_test_cases.json

Index: chrome/test/data/policy/policy_test_cases.json
diff --git a/chrome/test/data/policy/policy_test_cases.json b/chrome/test/data/policy/policy_test_cases.json
index b78c0f94b14497be8f6d2b95de4fd1e6525d3cdd..632b0486accb52ab297bdaf69db189a0cb1ae608 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -1882,6 +1882,7 @@
     "test_policy": { "SpokenFeedbackEnabled": true },
     "pref_mappings": [
       { "pref": "settings.accessibility",
+        "local_state": true,
         "indicator_tests": [
           { "policy": { "SpokenFeedbackEnabled": true } }
         ]