Require dialog when used

src/browser/atom-application.coffee

@@ -5,7 +5,6 @@ AutoUpdateManager = require './auto-update-manager'
 BrowserWindow = require 'browser-window'
 Menu = require 'menu'
 app = require 'app'
-dialog = require 'dialog'
 fs = require 'fs'
 ipc = require 'ipc'
 path = require 'path'
@@ -484,5 +483,7 @@ class AtomApplication
         when 'folder' then ['openDirectory']
         when 'all' then ['openFile', 'openDirectory']
         else throw new Error("#{type} is an invalid type for promptForPath")
+
+    dialog = require 'dialog'
     dialog.showOpenDialog title: 'Open', properties: properties.concat(['multiSelections', 'createDirectory']), (pathsToOpen) =>
       @openPaths({pathsToOpen, devMode, safeMode, window})

src/browser/atom-window.coffee

@@ -1,6 +1,5 @@
 BrowserWindow = require 'browser-window'
 app = require 'app'
-dialog = require 'dialog'
 path = require 'path'
 fs = require 'fs'
 url = require 'url'
@@ -101,6 +100,7 @@ class AtomWindow
     @browserWindow.on 'unresponsive', =>
       return if @isSpec
 
+      dialog = require 'dialog'
       chosen = dialog.showMessageBox @browserWindow,
         type: 'warning'
         buttons: ['Close', 'Keep Waiting']
@@ -111,6 +111,7 @@ class AtomWindow
     @browserWindow.webContents.on 'crashed', =>
       global.atomApplication.exit(100) if @exitWhenDone
 
+      dialog = require 'dialog'
       chosen = dialog.showMessageBox @browserWindow,
         type: 'warning'
         buttons: ['Close Window', 'Reload', 'Keep It Open']

src/browser/auto-update-manager.coffee

@@ -1,5 +1,4 @@
 autoUpdater = require 'auto-updater'
-dialog = require 'dialog'
 _ = require 'underscore-plus'
 {EventEmitter} = require 'events'
 
@@ -91,10 +90,12 @@ class AutoUpdateManager
 
   onUpdateNotAvailable: =>
     autoUpdater.removeListener 'error', @onUpdateError
+    dialog = require 'dialog'
     dialog.showMessageBox type: 'info', buttons: ['OK'], message: 'No update available.', detail: "Version #{@version} is the latest version."
 
   onUpdateError: (event, message) =>
     autoUpdater.removeListener 'update-not-available', @onUpdateNotAvailable
+    dialog = require 'dialog'
     dialog.showMessageBox type: 'warning', buttons: ['OK'], message: 'There was an error checking for updates.', detail: message
 
   getWindows: ->