Update http/resources/teshharnessreport.js to match CL 109763007.

LayoutTests/http/tests/resources/testharnessreport.js

 /*
  * THIS FILE INTENTIONALLY LEFT BLANK
  *
  * More specifically, this file is intended for vendors to implement
  * code needed to integrate testharness.js tests with their own test systems.
  *
  * Typically such integration will attach callbacks when each test is
  * has run, using add_result_callback(callback(test)), or when the whole test file has
  * completed, using add_completion_callback(callback(tests, harness_status)).
  *
@@ skipping 29 matching lines @@
 
 /*  Using a callback function, test results will be added to the page in a
 *   manner that allows dumpAsText to produce readable test results
 */
 add_completion_callback(function (tests, harness_status){
 
     // Create element to hold results
     var results = document.createElement("pre");
 
     // Declare result string
-    var resultStr = "\n";
+    var resultStr = "This is a testharness.js-based test.\n";
 
     // Check harness_status.  If it is not 0, tests did not
     // execute correctly, output the error code and message
     if(harness_status.status != 0){
         resultStr += "Harness Error. harness_status.status = " +
                      harness_status.status +
                      " , harness_status.message = " +
                      harness_status.message;
     }
     else {
         // Iterate through tests array and build string that contains
         // results for all tests
         for(var i=0; i<tests.length; i++){
             resultStr += convertResult(tests[i].status) + " " +
                         ( (tests[i].name!=null) ? tests[i].name : "" ) + " " +
                         ( (tests[i].message!=null) ? tests[i].message : "" ) +
                         "\n";
         }
     }
+    resultStr += "Harness: the test ran to completion.\n";
 
-    // Set results element's innerHTML to the results string
-    results.innerHTML = resultStr;
+    // Set results element's textContent to the results string
+    results.textContent = resultStr;
 
     // Add results element to document
     document.body.appendChild(results);
 
     if (self.testRunner)
         testRunner.notifyDone();
 });