DevTools: use target-based model accessors only.

LayoutTests/http/tests/inspector/resource-tree/resource-tree-test.js

 var initialize_ResourceTreeTest = function() {
 
 InspectorTest.dumpResources = function(formatter)
 {
     var results = [];
 
     function formatterWrapper(resource)
     {
         if (formatter)
             results.push({ resource: resource, text: formatter(resource) });
         else
             results.push({ resource: resource, text: resource.url });
     }
 
-    WebInspector.resourceTreeModel.forAllResources(formatterWrapper);
+    InspectorTest.resourceTreeModel.forAllResources(formatterWrapper);
 
     function comparator(result1, result2)
     {
         return result1.resource.url.localeCompare(result2.resource.url);
     }
     results.sort(comparator);
 
     for (var i = 0; i < results.length; ++i)
         InspectorTest.addResult(results[i].text);
 }
 
 InspectorTest.dumpResourcesURLMap = function()
 {
     var results = [];
-    WebInspector.resourceTreeModel.forAllResources(collect);
+    InspectorTest.resourceTreeModel.forAllResources(collect);
     function collect(resource)
     {
-        results.push({ url: resource.url, resource: WebInspector.resourceTreeModel.resourceForURL(resource.url) });
+        results.push({ url: resource.url, resource: InspectorTest.resourceTreeModel.resourceForURL(resource.url) });
     }
 
     function comparator(result1, result2)
     {
         if (result1.url > result2.url)
             return 1;
         if (result2.url > result1.url)
             return -1;
         return 0;
     }
@@ skipping 36 matching lines @@
     InspectorTest.addResult("");
     InspectorTest.addResult("Resources URL Map:");
     InspectorTest.dumpResourcesURLMap();
 
     InspectorTest.addResult("");
     InspectorTest.addResult("Resources Tree:");
     InspectorTest.dumpResourcesTree();
 }
 
 };