Bug 1862724: remove nimbus controls for macOS attribution. r=nalexander

The pref is being kept for now, to make it easy for QA to verify dynamic attribution when it is ready.

Depends on D192628

Differential Revision: https://phabricator.services.mozilla.com/D193799

Author: bhearsum

browser/components/attribution/AttributionCode.sys.mjs

@@ -16,7 +16,6 @@ import { AppConstants } from "resource://gre/modules/AppConstants.sys.mjs";
 const lazy = {};
 ChromeUtils.defineESModuleGetters(lazy, {
   MacAttribution: "resource:///modules/MacAttribution.sys.mjs",
-  NimbusFeatures: "resource://nimbus/ExperimentAPI.sys.mjs",
   UpdateUtils: "resource://gre/modules/UpdateUtils.sys.mjs",
 });
 ChromeUtils.defineLazyGetter(lazy, "log", () => {
@@ -246,13 +245,13 @@ export var AttributionCode = {
       return gCachedAttrData;
     }
 
-    // This is a temporary block while we rollout macOS attribution.
+    // This is a temporary block until we're ready to enable macOS reporting by default.
     if (
       AppConstants.platform == "macosx" &&
-      !lazy.NimbusFeatures.attribution.getVariable("macosEnabled")
+      !Services.prefs.getBoolPref("browser.attribution.macos.enabled")
     ) {
       lazy.log.debug(
-        "getAttrDataSync: macOS attribution disabled by nimbus; skipping"
+        "getAttrDataSync: macOS attribution disabled by pref; skipping"
       );
       return {};
     }

toolkit/components/nimbus/FeatureManifest.yaml

@@ -2001,16 +2001,6 @@ feltPrivacy:
       description: >-
         Enables the reset PBM feature button and confirmation panel.
 
-attribution:
-  description: Prefs related to install attribution
-  hasExposure: false
-  isEarlyStartup: true
-  variables:
-    macosEnabled:
-      type: boolean
-      description: Whether or not macOS attribution data will be processed and sent in Telemetry
-      fallbackPref: browser.attribution.macos.enabled
-
 phc:
   description: Prefs to control the Probabalistic Heap Checker (PHC)
   owner: pbone@mozilla.com