[DevTools] Track URL through the target

third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 52 matching lines @@
         return "";
 
     var resource = WebInspector.resourceForURL(url);
     if (resource)
         return resource.displayName;
 
     var uiSourceCode = WebInspector.networkMapping.uiSourceCodeForURLForAnyTarget(url);
     if (uiSourceCode)
         return uiSourceCode.displayName();
 
-    if (!WebInspector.targetManager.inspectedPageURL())
+    var mainTarget = WebInspector.targetManager.mainTarget();
+    var inspectedURL = mainTarget && mainTarget.inspectedURL();
+    if (!inspectedURL)
         return url.trimURL("");
 
-    var parsedURL = WebInspector.targetManager.inspectedPageURL().asParsedURL();
+    var parsedURL = inspectedURL.asParsedURL();
     var lastPathComponent = parsedURL ? parsedURL.lastPathComponent : parsedURL;
-    var index = WebInspector.targetManager.inspectedPageURL().indexOf(lastPathComponent);
-    if (index !== -1 && index + lastPathComponent.length === WebInspector.targetManager.inspectedPageURL().length) {
-        var baseURL = WebInspector.targetManager.inspectedPageURL().substring(0, index);
+    var index = inspectedURL.indexOf(lastPathComponent);
+    if (index !== -1 && index + lastPathComponent.length === inspectedURL.length) {
+        var baseURL = inspectedURL.substring(0, index);
         if (url.startsWith(baseURL))
             return url.substring(index);
     }
 
     if (!parsedURL)
         return url;
 
     var displayName = url.trimURL(parsedURL.host);
     return displayName === "/" ? parsedURL.host + "/" : displayName;
 }