Fix using BrowserWindow as parameter for ipc.sendChannel.

browser/api/lib/auto-updater.coffee

@@ -23,6 +23,6 @@ autoUpdater.quitAndInstall = ->
 
   # Tell all windows to remove beforeunload handler and then close itself.
   ipc = require 'ipc'
-  ipc.sendChannel win.getProcessId(), win.getRoutingId(), 'ATOM_SHELL_SILENT_CLOSE' for win in windows
+  ipc.sendChannel win, 'ATOM_SHELL_SILENT_CLOSE' for win in windows
 
 module.exports = autoUpdater

browser/api/lib/ipc.coffee

@@ -5,6 +5,7 @@ sendWrap = (channel, processId, routingId, args...) ->
   BrowserWindow = require 'browser-window'
   if processId?.constructor is BrowserWindow
     window = processId
+    args = [routingId, args...]
     processId = window.getProcessId()
     routingId = window.getRoutingId()