Clean variable __navigated_to_report when starting tests.

tools/page_cycler/common/start.js

-// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
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-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
 
 // This script runs the page cycler.  It assumes that __pages is an array
 // containing the directories for various pages to exercise.
 
 document.title = "page cycler";
 
 var initialPage = __pages[0];
 
+document.cookie = "__navigated_to_report=0; path=/";
 document.cookie = "__pc_done=0; path=/";
 document.cookie = "__pc_pages=" + __pages + "; path=/";
 document.cookie = "__pc_timings=; path=/";
 
 var options = location.search.substring(1).split('&');
 
 function getopt(name) {
   var r = new RegExp("^" + name + "=");
   for (i = 0; i < options.length; ++i) {
     if (options[i].match(r)) {
@@ skipping 35 matching lines @@
 render_form();
 
 // should we start automatically?
 if (location.search.match("auto=1")) {
   start();
 } else {
   document.write("<h3>Note: You must have started chrome with <tt>--enable-file-cookies --js-flags=\"--expose_gc\"</tt> for this test to work manually.</h3>");
   if (!window.gc)
     document.write("<h3 style='color:red'>WARNING: window.gc is not defined.  Test results may be unreliable!</h3>");
 }