[DevTools] Track URL through the target

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

Index: third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js
diff --git a/third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js b/third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js
index 97de0586200754321ab7fe0cf5284e3bcb537bf1..202a35f3f175b761b8c411b058292a8f72e99f2d 100644
--- a/third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js
+++ b/third_party/WebKit/Source/devtools/front_end/bindings/ResourceUtils.js
@@ -70,14 +70,16 @@ WebInspector.displayNameForURL = function(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);
     }