Bug 1427726 - remove pref from preference_usage performance test, r=johannh

MozReview-Commit-ID: saPO7fgcow

--HG--
extra : rebase_source : e5911a084aab98f749767d9934159c75c253fdc6

browser/base/content/test/performance/browser_preferences_usage.js

@@ -97,10 +97,6 @@ add_task(async function startup() {
       min: 20,
       max: 55,
     },
-    // This seems to get called frequently only on infra.
-    "network.jar.block-remote-files": {
-      max: 500,
-    },
   };
 
   let startupRecorder = Cc["@mozilla.org/test/startuprecorder;1"].getService().wrappedJSObject;
@@ -161,8 +157,6 @@ add_task(async function open_10_tabs() {
       min: 5,
       max: 20,
     },
-    // This seems to get called frequently only on infra.
-    "network.jar.block-remote-files": { },
   };
 
   Services.prefs.resetStats();