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..aa7c1fc3c341d05653b508a7a02ed09c95786fbf 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;
 
@@ -307,7 +311,15 @@ void InstalledLoader::LoadAllExtensions() {
   }
 
   for (size_t i = 0; i < extensions_info->size(); ++i) {
-    if (extensions_info->at(i)->extension_location != Manifest::COMMAND_LINE)
+    // Don't load saved extensions from the command line.
+    bool should_load =
+        extensions_info->at(i)->extension_location != Manifest::COMMAND_LINE;
+#if defined(OS_CHROMEOS)
+    // Also don't load saved extensions in the signin profile.
+    if (chromeos::ProfileHelper::IsSigninProfile(profile))

[Devlin, 2017/03/17 16:37:23]

We should just early out of this whole function, or not call it in the first
place.  The only point is to load extensions from prefs, so if we're not doing
that, there's nothing to do.

[achuithb, 2017/03/22 00:15:53]

Done.

+      should_load = false;
+#endif
+    if (should_load)
       Load(*extensions_info->at(i), should_write_prefs);
   }