Security panel: observe targets before adding listeners.

Source/devtools/front_end/security/SecurityPanel.js

Index: Source/devtools/front_end/security/SecurityPanel.js
diff --git a/Source/devtools/front_end/security/SecurityPanel.js b/Source/devtools/front_end/security/SecurityPanel.js
index ad82aa90effff7aeba2908ea27b7d0dffe22d650..d061e992e2a2b83a6a0ae0ffbecf87a99e78f39e 100644
--- a/Source/devtools/front_end/security/SecurityPanel.js
+++ b/Source/devtools/front_end/security/SecurityPanel.js
@@ -34,10 +34,10 @@ WebInspector.SecurityPanel = function()
     this._origins = new Map();
     // TODO(lgarron): add event listeners to call _clear() once we figure out how to clear the panel properly (https://crbug.com/522762).
 
+    WebInspector.targetManager.observeTargets(this);
+
     WebInspector.targetManager.addModelListener(WebInspector.NetworkManager, WebInspector.NetworkManager.EventTypes.ResponseReceivedSecurityDetails, this._onResponseReceivedSecurityDetails, this);
     WebInspector.targetManager.addModelListener(WebInspector.SecurityModel, WebInspector.SecurityModel.EventTypes.SecurityStateChanged, this._onSecurityStateChanged, this);
-
-    WebInspector.targetManager.observeTargets(this);
 }
 
 /** @typedef {string} */