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

BUG=503399

Review URL: https://codereview.chromium.org/1317863004

git-svn-id: svn://svn.chromium.org/blink/trunk@201341 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/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");