DevTools: Get rid of WebInspector.debuggerModel in NetworkUISourceCodeProvider

LayoutTests/http/tests/inspector/stylesheet-source-mapping.html

Index: LayoutTests/http/tests/inspector/stylesheet-source-mapping.html
diff --git a/LayoutTests/http/tests/inspector/stylesheet-source-mapping.html b/LayoutTests/http/tests/inspector/stylesheet-source-mapping.html
index 0a71f2c7b39d1d931b41897564d35dd5d1a01479..d6377676e8e6c36e94d665347ed36c3d92ee357f 100644
--- a/LayoutTests/http/tests/inspector/stylesheet-source-mapping.html
+++ b/LayoutTests/http/tests/inspector/stylesheet-source-mapping.html
@@ -51,7 +51,7 @@ function test()
     {
         const documentURL = "http://localhost:8000/inspector/stylesheet-source-mapping.html";
         const frame = WebInspector.resourceTreeModel.mainFrame;
-        var resource = new WebInspector.Resource(null, url, documentURL, frame.id, frame.loaderId, WebInspector.resourceTypes.Stylesheet, mimeType);
+        var resource = new WebInspector.Resource(WebInspector.resourceTreeModel.target(), null, url, documentURL, frame.id, frame.loaderId, WebInspector.resourceTypes.Stylesheet, mimeType);
         resource.requestContent = function(callback)
         {
             callback(content, false, mimeType);