Automatically trigger installation of high-quality speech synthesis extension.

chrome/browser/chromeos/login/user_manager_impl.h

Index: chrome/browser/chromeos/login/user_manager_impl.h
diff --git a/chrome/browser/chromeos/login/user_manager_impl.h b/chrome/browser/chromeos/login/user_manager_impl.h
index 074e329cfcf5298f87832d2288d1d700ae346271..7a397e2e9f45edec2eb3317fe1d836409cc935f7 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.h
+++ b/chrome/browser/chromeos/login/user_manager_impl.h
@@ -30,6 +30,10 @@
 class PrefService;
 class ProfileSyncService;
 
+namespace extensions {
+class ExternalComponentLoaderTest;
+}
+
 namespace policy {
 struct DeviceLocalAccount;
 }
@@ -149,6 +153,7 @@ class UserManagerImpl
       scoped_ptr<locale_util::SwitchLanguageCallback> callback) const OVERRIDE;
 
  private:
+  friend class extensions::ExternalComponentLoaderTest;
   friend class SupervisedUserManagerImpl;
   friend class UserManager;
   friend class WallpaperManager;