Enable login screen apps.

chrome/browser/extensions/installed_loader.cc

Index: chrome/browser/extensions/installed_loader.cc
diff --git a/chrome/browser/extensions/installed_loader.cc b/chrome/browser/extensions/installed_loader.cc
index 4f3cf1bec413ebf5f774f03334147a1a082f12cc..6e6fd2fcca827e3ebbe1166b7a7433f8a796df74 100644
--- a/chrome/browser/extensions/installed_loader.cc
+++ b/chrome/browser/extensions/installed_loader.cc
@@ -42,6 +42,10 @@
 #include "extensions/common/manifest_handlers/background_info.h"
 #include "extensions/common/manifest_url_handlers.h"
 
+#if defined(OS_CHROMEOS)
+#include "chrome/browser/chromeos/profiles/profile_helper.h"
+#endif
+
 using base::UserMetricsAction;
 using content::BrowserThread;
 
@@ -307,6 +311,11 @@ void InstalledLoader::LoadAllExtensions() {
   }
 
   for (size_t i = 0; i < extensions_info->size(); ++i) {
+#if defined(OS_CHROMEOS)
+    // Don't load saved extensions in signin profile.
+    if (chromeos::ProfileHelper::IsSigninProfile(profile))
+      break;
+#endif
     if (extensions_info->at(i)->extension_location != Manifest::COMMAND_LINE)
       Load(*extensions_info->at(i), should_write_prefs);
   }