Use new IPC API of atom-shell.

src/browser/atom-application.coffee

@@ -191,7 +191,7 @@ class AtomApplication
       @emit('application:new-window')
 
     # A request from the associated render process to open a new render process.
-    ipc.on 'open', (processId, routingId, options) =>
+    ipc.on 'open', (event, options) =>
       if options?
         if options.pathsToOpen?.length > 0
           @openPaths(options)
@@ -200,21 +200,21 @@ class AtomApplication
       else
         @promptForPath()
 
-    ipc.on 'update-application-menu', (processId, routingId, template, keystrokesByCommand) =>
+    ipc.on 'update-application-menu', (event, template, keystrokesByCommand) =>
       @applicationMenu.update(template, keystrokesByCommand)
 
-    ipc.on 'run-package-specs', (processId, routingId, specDirectory) =>
+    ipc.on 'run-package-specs', (event, specDirectory) =>
       @runSpecs({resourcePath: global.devResourcePath, specDirectory: specDirectory, exitWhenDone: false})
 
-    ipc.on 'command', (processId, routingId, command) =>
+    ipc.on 'command', (event, command) =>
       @emit(command)
 
-    ipc.on 'window-command', (processId, routingId, command, args...) ->
-      win = BrowserWindow.fromProcessIdAndRoutingId(processId, routingId)
+    ipc.on 'window-command', (event, command, args...) ->
+      win = BrowserWindow.fromWebContents(event.sender)
       win.emit(command, args...)
 
-    ipc.on 'call-window-method', (processId, routingId, method, args...) ->
-      win = BrowserWindow.fromProcessIdAndRoutingId(processId, routingId)
+    ipc.on 'call-window-method', (event, method, args...) ->
+      win = BrowserWindow.fromWebContents(event.sender)
       win[method](args...)
 
   # Public: Executes the given command.

src/browser/atom-window.coffee

@@ -2,7 +2,6 @@ BrowserWindow = require 'browser-window'
 ContextMenu = require './context-menu'
 app = require 'app'
 dialog = require 'dialog'
-ipc = require 'ipc'
 path = require 'path'
 fs = require 'fs'
 url = require 'url'
@@ -136,7 +135,7 @@ class AtomWindow
 
   sendCommandToBrowserWindow: (command, args...) ->
     action = if args[0]?.contextCommand then 'context-command' else 'command'
-    ipc.sendChannel @browserWindow.getProcessId(), @browserWindow.getRoutingId(), action, command, args...
+    @browserWindow.webContents.send action, command, args...
 
   getDimensions: ->
     [x, y] = @browserWindow.getPosition()