Moved CrxInstaller and CrxInstallerError into extensions namespace

chrome/browser/policy/app_pack_updater.h

Index: chrome/browser/policy/app_pack_updater.h
diff --git a/chrome/browser/policy/app_pack_updater.h b/chrome/browser/policy/app_pack_updater.h
index c8f5733b03d4333a467df0da7252c441763c672e..e8fd157928bd1d1bf1e206d0f570ef90dae0309e 100644
--- a/chrome/browser/policy/app_pack_updater.h
+++ b/chrome/browser/policy/app_pack_updater.h
@@ -22,12 +22,12 @@
 #include "content/public/browser/notification_registrar.h"
 #include "net/base/network_change_notifier.h"
 
-class CrxInstaller;
 class ExternalExtensionLoader;
 class FilePath;
 class GURL;
 
 namespace extensions {
+class CrxInstaller;
 class ExtensionDownloader;
 }