Change the DevTools Security panel to be a non-hidden experiment.

Source/devtools/front_end/main/Main.js

Index: Source/devtools/front_end/main/Main.js
diff --git a/Source/devtools/front_end/main/Main.js b/Source/devtools/front_end/main/Main.js
index b78d6e78a0ea8e74dc0dadbc7ab404a5dca6e2ff..2cf367937c0f301c093d77318eea629ca9aa3b70 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -139,7 +139,7 @@ WebInspector.Main.prototype = {
         Runtime.experiments.register("networkRequestsOnTimeline", "Network requests on Timeline", true);
         Runtime.experiments.register("privateScriptInspection", "Private script inspection");
         Runtime.experiments.register("promiseTracker", "Promise inspector");
-        Runtime.experiments.register("securityPanel", "Security panel", true);
+        Runtime.experiments.register("securityPanel", "Security panel");
         Runtime.experiments.register("serviceWorkersInResources", "Service workers in Resources panel", true);
         Runtime.experiments.register("showPrimaryLoadWaterfallInNetworkTimeline", "Show primary load waterfall in Network timeline", true);
         Runtime.experiments.register("stepIntoAsync", "Step into async");