[Devtools] Fix to XMLView in Network Preview panel broken

third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js

Index: third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js
diff --git a/third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js b/third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js
index c09084858f60b23a5b83d39d81f8ac866edc3435..5c77d9ee6aacc72c2ff05f885ed370fc90bd6c6a 100644
--- a/third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js
+++ b/third_party/WebKit/Source/devtools/front_end/network/RequestPreviewView.js
@@ -148,8 +148,10 @@ WebInspector.RequestPreviewView.prototype = {
         }
 
         var xmlView = this._xmlView();
-        if (xmlView)
-            return xmlView;
+        if (xmlView) {
+            callback(xmlView);
+            return;
+        }
 
         WebInspector.JSONView.parseJSON(this._requestContent()).then(chooseView.bind(this)).then(callback);