Allow settings dialog to be opened via the app launcher, as a packaged app.

chrome/renderer/resources/extensions/app_window_custom_bindings.js

Index: chrome/renderer/resources/extensions/app_window_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/app_window_custom_bindings.js b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
index 651d871df1df016607ac096891c4c63da3a13ac4..f38af8b7de44c0c819051807f464cb01cb9e55bb 100644
--- a/chrome/renderer/resources/extensions/app_window_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/app_window_custom_bindings.js
@@ -14,9 +14,13 @@ chromeHidden.registerCustomHook('app.window', function(bindingsAPI) {
   var apiFunctions = bindingsAPI.apiFunctions;
   apiFunctions.setCustomCallback('create',
                                  function(name, request, windowParams) {
-    if (!windowParams.viewId) {
-      // Create failed? If given a callback, trigger it with an undefined
-      // object.
+    var view = null;
+    if (windowParams.viewId)
+      view = GetView(windowParams.viewId, windowParams.injectTitlebar);
+
+    if (!view) {
+      // No route to created window. If given a callback, trigger it with an
+      // undefined object.
       if (request.callback) {
         request.callback()
         delete request.callback;
@@ -24,8 +28,6 @@ chromeHidden.registerCustomHook('app.window', function(bindingsAPI) {
       return;
     }
 
-    var view = GetView(windowParams.viewId, windowParams.injectTitlebar);
-
     // Initialize appWindowData in the newly created JS context
     view.chrome.app.window.initializeAppWindow(windowParams);