Browser plugin: Implement loadRedirect event.

content/test/data/browser_plugin_embedder.html

Index: content/test/data/browser_plugin_embedder.html
diff --git a/content/test/data/browser_plugin_embedder.html b/content/test/data/browser_plugin_embedder.html
index 5348b720ec7ba8f095591b99aae719a03624fbac..7c28dd522b39e340af52d4de873c1ff94df63253 100644
--- a/content/test/data/browser_plugin_embedder.html
+++ b/content/test/data/browser_plugin_embedder.html
@@ -5,6 +5,15 @@ function loadAbort(evt) {
 function loadStart(evt) {
   document.title = evt.url;
 }
+var redirectOldUrl;
+var redirectNewUrl;
+function loadRedirect(event) {
+  document.title = "redirected";
+  if (event.isTopLevel) {
+    redirectOldUrl = event.oldUrl;
+    redirectNewUrl = event.newUrl;
+  }
+}
 function SetSrc(src) {
   var plugin = document.getElementById('plugin');
   plugin.src = src;
@@ -43,4 +52,5 @@ document.title = 'embedder';
   var plugin = document.getElementById('plugin');
   plugin.addEventListener('loadStart', loadStart);
   plugin.addEventListener('loadAbort', loadAbort);
+  plugin.addEventListener('loadRedirect', loadRedirect);
 </script>