DevTools: get rid of WebInspector.cssModel, use target models instead

LayoutTests/inspector/network/network-filter-updated-requests.html

Index: LayoutTests/inspector/network/network-filter-updated-requests.html
diff --git a/LayoutTests/inspector/network/network-filter-updated-requests.html b/LayoutTests/inspector/network/network-filter-updated-requests.html
index df1dbea81c8fb361d84a862cb456a00e95ea7775..c9bb718565c73ca405f4b36f63608fa44393b676 100644
--- a/LayoutTests/inspector/network/network-filter-updated-requests.html
+++ b/LayoutTests/inspector/network/network-filter-updated-requests.html
@@ -10,11 +10,11 @@ function test() {
     target._resourceTypeFilterUI._toggleTypeFilter(types.XHR.name(), false);
     InspectorTest.addResult("Clicked '" + types.XHR.name() + "' button.");
 
-    var requestFoo = new WebInspector.NetworkRequest(WebInspector.targetManager.activeTarget(), "", "", "", "", "");
+    var requestFoo = new WebInspector.NetworkRequest(WebInspector.targetManager.mainTarget(), "", "", "", "", "");
     requestFoo.type = types.Script;
     requestFoo.requestId = "foo";
     target._appendRequest(requestFoo);
-    var requestBar = new WebInspector.NetworkRequest(WebInspector.targetManager.activeTarget(), "", "", "", "", "");
+    var requestBar = new WebInspector.NetworkRequest(WebInspector.targetManager.mainTarget(), "", "", "", "", "");
     requestBar.type = types.Script;
     requestBar.requestId = "bar";
     target._appendRequest(requestBar);