DevTools: clean up tests to not depend on NetworkProject.addFile method

third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html

Index: third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html
index 04dfca8678ed40c3e7c91429ae5b85c3657c4e0b..b465383019b6262623eb0be8a9dc15643c677b12 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/persistence/persistence-sync-content-nodejs.html
@@ -6,7 +6,7 @@
 <script src="./persistence-test.js"></script>
 <script>
 
-function test()
+async function test()
 {
     // Pretend we are running under V8 front-end.
     SDK.targetManager.mainTarget().setIsNodeJSForTest();
@@ -26,12 +26,7 @@ function test()
     InspectorTest.addResult("\n Initial network content:");
     InspectorTest.addResult(indent(nodeContent));
 
-    // Add network UISourceCode.
-    var networkProject = Bindings.NetworkProject.forTarget(SDK.targetManager.mainTarget());
-    var resourceTreeModel = SDK.ResourceTreeModel.fromTarget(SDK.targetManager.mainTarget());
-    var mainFrame = resourceTreeModel.mainFrame;
-    var contentProvider = new Common.StaticContentProvider("http://127.0.0.1:8000/nodejs.js", Common.resourceTypes.Script, () => Promise.resolve(nodeContent));
-    networkProject.addFile(contentProvider, mainFrame, false);
+    await InspectorTest.addScriptUISourceCode("http://127.0.0.1:8000/nodejs.js", nodeContent);
 
     // Add filesystem UISourceCode and mapping.
     var fs = new InspectorTest.TestFileSystem("file:///var/www");