Plumb listenerIDs correctly for events that clobber chrome.Event.prototype.dispatch.

chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js

Index: chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js b/chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js
index 4ce96be9f1703e5bb55fd119976bb6ee1ef22ddf..17af969cb598bb4cd8a8ba36166fe099c4fb1d72 100644
--- a/chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js
@@ -10,17 +10,22 @@ var GetExternalFileEntry = fileBrowserNatives.GetExternalFileEntry;
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 
 chromeHidden.Event.registerArgumentMassager('fileBrowserHandler.onExecute',
-    function(args) {
-  if (args.length < 2)
+    function(args, dispatch) {
+  if (args.length < 2) {
+    dispatch(args);
     return;
+  }
   var fileList = args[1].entries;
-  if (!fileList)
+  if (!fileList) {
+    dispatch(args);
     return;
+  }
   // The second parameter for this event's payload is file definition
   // dictionary that we used to reconstruct File API's Entry instance
   // here.
   for (var i = 0; i < fileList.length; i++)
     fileList[i] = GetExternalFileEntry(fileList[i]);
+  dispatch(args);
 });
 
 chromeHidden.registerCustomHook('fileBrowserHandler', function(bindingsAPI) {