Support cross-process window.close() messages.

chrome/test/data/click-noreferrer-links.html

Index: chrome/test/data/click-noreferrer-links.html
diff --git a/chrome/test/data/click-noreferrer-links.html b/chrome/test/data/click-noreferrer-links.html
index f60f1edc14d4cb3d8e9348f6d25fd9213ef0706e..867279ac11be0278cbc08ae3a823bcf5626ee472 100644
--- a/chrome/test/data/click-noreferrer-links.html
+++ b/chrome/test/data/click-noreferrer-links.html
@@ -33,11 +33,19 @@
   }
 
   function testScriptAccessToWindow() {
+    // Grab a reference to the existing foo window and access its location.
     var w = window.open("", "foo");
     var url = w.location.href;
     return url != undefined;
   }
 
+  function testCloseWindow() {
+    // Grab a reference to the existing foo window and close it.
+    var w = window.open("", "foo");
+    w.close();
+    return true;
+  }
+
  </script>
  </head>