Fix the System Profile to not load extensions. It could otherwise be forced to by GPO.

chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/ash/launcher/chrome_launcher_controller.h"
 
 #include <vector>
 
 #include "ash/ash_switches.h"
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 356 matching lines @@
       item_delegate_manager_(NULL),
       profile_(profile),
       app_sync_ui_state_(NULL),
       ignore_persist_pinned_state_change_(false) {
   if (!profile_) {
     // If no profile was passed, we take the currently active profile and use it
     // as the owner of the current desktop.
     // Use the original profile as on chromeos we may get a temporary off the
     // record profile, unless in guest session (where off the record profile is
     // the right one).
-    Profile* active_profile = ProfileManager::GetActiveUserProfile();
-    profile_ = active_profile->IsGuestSession() ? active_profile :
-        active_profile->GetOriginalProfile();
+    profile_ = ProfileManager::GetActiveUserProfile();
+    if (!profile_->IsGuestSession() && !profile_->IsSystemProfile())
+      profile_ = profile_->GetOriginalProfile();
 
     app_sync_ui_state_ = AppSyncUIState::Get(profile_);
     if (app_sync_ui_state_)
       app_sync_ui_state_->AddObserver(this);
   }
 
   // All profile relevant settings get bound to the current profile.
   AttachProfile(profile_);
   model_->AddObserver(this);
 
@@ skipping 1655 matching lines @@
   if (!app_list_icon_added) {
     pinned_apps.insert(pinned_apps.begin(), kAppShelfIdPlaceholder);
   }
   return pinned_apps;
 }
 
 bool ChromeLauncherController::IsIncognito(
     const content::WebContents* web_contents) const {
   const Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
-  return profile->IsOffTheRecord() && !profile->IsGuestSession();
+  return profile->IsOffTheRecord() && !profile->IsGuestSession() &&
+         !profile->IsSystemProfile();
 }
 
 void ChromeLauncherController::CloseWindowedAppsFromRemovedExtension(
     const std::string& app_id,
     const Profile* profile) {
   // This function cannot rely on the controller's enumeration functionality
   // since the extension has already be unloaded.
   const BrowserList* ash_browser_list =
       BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_ASH);
   std::vector<Browser*> browser_to_close;
@@ skipping 73 matching lines @@
 void ChromeLauncherController::ReleaseProfile() {
   if (app_sync_ui_state_)
     app_sync_ui_state_->RemoveObserver(this);
 
   extensions::ExtensionRegistry::Get(profile_)->RemoveObserver(this);
 
   PrefServiceSyncable::FromProfile(profile_)->RemoveObserver(this);
 
   pref_change_registrar_.RemoveAll();
 }