Fix regression with back-button not working on prerendered and instant pages.

chrome/test/data/prerender/prerender_loader.html

Index: chrome/test/data/prerender/prerender_loader.html
diff --git a/chrome/test/data/prerender/prerender_loader.html b/chrome/test/data/prerender/prerender_loader.html
index f8089d3573e2c44ca32cc3187fecf37333b12c46..3a364b6c3ce3320c7f1042eb54577117e519924a 100644
--- a/chrome/test/data/prerender/prerender_loader.html
+++ b/chrome/test/data/prerender/prerender_loader.html
@@ -4,14 +4,21 @@
 
 <script>
   function ClickOpenLinkInNewWindow() {
-    var eventObject = document.createEvent("MouseEvents");
+    var eventObject = document.createEvent('MouseEvents');
     eventObject.initMouseEvent('click');
-    document.getElementById("toClick").dispatchEvent(eventObject);
+    document.getElementById('toClickTarget').dispatchEvent(eventObject);
+    return true;
+  }
+
+  function ClickOpenLink() {
+    var eventObject = document.createEvent('MouseEvents');
+    eventObject.initMouseEvent('click');
+    document.getElementById('toClick').dispatchEvent(eventObject);
     return true;
   }
 
   function JsOpenLinkInNewWindow() {
-    window.open("REPLACE_WITH_PRERENDER_URL");
+    window.open('REPLACE_WITH_PRERENDER_URL');
     return true;
   }
 </script>
@@ -21,7 +28,8 @@
 <script>
   document.write('<link rel="prerender" href="REPLACE_WITH_PRERENDER_URL"/>');
 </script>
-<a target="_blank" id="toClick"
-   href="REPLACE_WITH_PRERENDER_URL">Link To Click</a>
+<a target="_blank" id="toClickTarget"
+   href="REPLACE_WITH_PRERENDER_URL">Link To click in new window</a>
+<a id="toClick" href="REPLACE_WITH_PRERENDER_URL">Link to click</a>
 </body>
 </html>