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

chrome/renderer/resources/extensions/file_browser_handler_custom_bindings.js

 // Copyright (c) 2012 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.
 
 // Custom bindings for the fileBrowserHandler API.
 
 var fileBrowserNatives = requireNative('file_browser_handler');
 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) {
   var apiFunctions = bindingsAPI.apiFunctions;
 
   apiFunctions.setHandleRequest('selectFile',
                                 function(selectionParams, callback) {
     function internalCallback(externalCallback, internalResult) {
       if (!externalCallback)
         return;
       var result = undefined;
       if (internalResult) {
         result = { success: internalResult.success, entry: null };
         if (internalResult.success)
           result.entry = GetExternalFileEntry(internalResult.entry);
       }
 
       externalCallback(result);
     }
 
     return chromeHidden.internalAPIs.fileBrowserHandlerInternal.selectFile(
         selectionParams, internalCallback.bind(null, callback));
   });
 });