[DevTools] Explicitly require ResourceTreeModel

third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js

Index: third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js b/third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js
index 8205e9df884412ff521d23fc2973ff8c51b3fad9..080bf1bc28280e6c2236b56a285d148484ea95f2 100644
--- a/third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/security/SecurityPanel.js
@@ -248,9 +248,9 @@ WebInspector.SecurityPanel.prototype = {
 
         this._target = target;
 
-        if (target.hasBrowserCapability())
-            target.resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._onMainFrameNavigated, this);
-
+        var resourceTreeModel = WebInspector.ResourceTreeModel.fromTarget(this._target);
+        if (resourceTreeModel)
+            resourceTreeModel.addEventListener(WebInspector.ResourceTreeModel.EventTypes.MainFrameNavigated, this._onMainFrameNavigated, this);
         var networkManager = WebInspector.NetworkManager.fromTarget(target);
         networkManager.addEventListener(WebInspector.NetworkManager.EventTypes.ResponseReceived, this._onResponseReceived, this);
         networkManager.addEventListener(WebInspector.NetworkManager.EventTypes.RequestFinished, this._onRequestFinished, this);