DevTools: do not allow using 'this' before call into super.

third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html

Index: third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html b/third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html
index defb7f692a10e9eddb455d5d8450cdadda18d4f2..357d7765fb6f99d44e11cce1328529aba59e6aca 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector-unit/text-prompt.html
@@ -6,7 +6,8 @@
 <script>
 function test() {
     var suggestions = ["heyoo", "hey it's a suggestion", "hey another suggestion"];
-    var prompt = new WebInspector.TextPrompt((element, range, force, callback) => callback(suggestions));
+    var prompt = new WebInspector.TextPrompt();
+    prompt.initialize((element, range, force, callback) => callback(suggestions));
     prompt.setSuggestBoxEnabled(true);
     var div = document.createElement("div");
     WebInspector.inspectorView.element.appendChild(div);