fixup! Bug 40002: Remove about:ion

Remove this._monitorIonPref() and this._monitorIonStudies() from BrowserGlue


(cherry picked from commit fc08631d08d49082680b7133571b893242a21dd5)

browser/components/BrowserGlue.jsm

@@ -2321,8 +2321,6 @@ BrowserGlue.prototype = {
     this._monitorScreenshotsPref();
     this._monitorWebcompatReporterPref();
     this._monitorHTTPSOnlyPref();
-    this._monitorIonPref();
-    this._monitorIonStudies();
     this._setupSearchDetection();
 
     this._monitorGPCPref();