[Devtools] Fixed resource having no content if from xhr blob

third_party/WebKit/LayoutTests/http/tests/inspector-protocol/resources/protocol-test.html

 <!--
 Copyright (C) 2012 Samsung Electronics. All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:
 
 1.  Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.
 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 280 matching lines @@
 InspectorTest.evaluateInPage = function(string, callback)
 {
     this.sendCommand("Runtime.evaluate", { "expression": string }, function(message) {
         if (message.error)
             InspectorTest.log("Error while executing '" + string + "': " + message.error.message);
         else if (callback)
             callback(message.result.result.value);
     });
 };
 
+/**
+ * Evaluates expression in page.

[dgozman, 2017/05/02 19:36:37]

We don't add comments.

+ * @param {string} expression
+ * @return {!Promise<?>}
+ */
+InspectorTest.evaluateInPagePromise = function(expression)
+{
+    return InspectorTest.sendCommandPromise("Runtime.evaluate", { "expression": expression, awaitPromise: false, returnByValue: true });
+};
+
+// Use this if the expression being ran in page is a promise.
 InspectorTest.evaluateInPageAsync = function(expression)
 {
     return InspectorTest.sendCommandPromise("Runtime.evaluate", { "expression": expression, awaitPromise: true, returnByValue: true }).then((message) => message.result.result.value);
 }
 
 InspectorTest.completeTestIfError = function(messageObject)
 {
     if (messageObject.error) {
         InspectorTest.log(messageObject.error.message);
         InspectorTest.completeTest();
@@ skipping 114 matching lines @@
             callback();
         }
     }
 }
 
 window.addEventListener("load", InspectorTest.readyForTest.bind(InspectorTest), false);
 
 </script>
 </head>
 </html>