cros: Allow default app order to be loaded from an external file.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index 3561479b467092560167c4d74a32313ce3879e15..073b65f1f294bbf8c952fc0bd095d9b44ffa5629 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -22,6 +22,11 @@ class ScreenLockObserver;
 class SessionManagerObserver;
 class UserActivityNotifier;
 class VideoActivityNotifier;
+
+namespace default_app_order {
+class ExternalLoader;
+}
+
 }  // namespace chromeos
 
 namespace contacts {
@@ -56,6 +61,7 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
 
   scoped_ptr<contacts::ContactManager> contact_manager_;
   scoped_ptr<chromeos::BrightnessObserver> brightness_observer_;
+  scoped_ptr<chromeos::default_app_order::ExternalLoader> app_order_loader_;
   scoped_ptr<chromeos::OutputObserver> output_observer_;
   scoped_ptr<chromeos::ResumeObserver> resume_observer_;
   scoped_ptr<chromeos::ScreenLockObserver> screen_lock_observer_;