Bug 1502779 - Backed out changeset 38c1fc84fcaf (bug 1500251). r=backout

The telemetry added in bug 1500251 is no longer needed, so should be backed out.

modules/libpref/init/all.js

@@ -5950,6 +5950,5 @@ pref("prio.enabled", false);
 #ifdef NIGHTLY_BUILD
 // Bug 1499552; add a dummy pref to verify that collection of preferences
 // via telemetry is working as expected.
-pref("app.normandy.test.with_true_default", true);
-pref("app.normandy.test.with_false_default", false);
+pref("app.normandy.test.with_default", false);
 #endif

toolkit/components/telemetry/app/TelemetryEnvironment.jsm

@@ -183,8 +183,7 @@ const DEFAULT_ENVIRONMENT_PREFS = new Map([
   ["app.support.baseURL", {what: RECORD_PREF_VALUE}],
   ["accessibility.browsewithcaret", {what: RECORD_PREF_VALUE}],
   ["accessibility.force_disabled", {what:  RECORD_PREF_VALUE}],
-  ["app.normandy.test.with_true_default", {what: RECORD_PREF_VALUE}],
-  ["app.normandy.test.with_false_default", {what: RECORD_PREF_VALUE}],
+  ["app.normandy.test.with_default", {what: RECORD_PREF_VALUE}],
   ["app.normandy.test.without_default", {what: RECORD_PREF_VALUE}],
   ["app.shield.optoutstudies.enabled", {what: RECORD_PREF_VALUE}],
   ["app.update.auto", {what: RECORD_PREF_VALUE}],