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

chrome/browser/ui/browser_command_controller.cc

 // Copyright (c) 2012 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/browser_command_controller.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 936 matching lines @@
   command_updater_.UpdateCommandEnabled(IDC_ENCODING_WINDOWS1255, true);
   command_updater_.UpdateCommandEnabled(IDC_ENCODING_WINDOWS1258, true);
 
   // Zoom
   command_updater_.UpdateCommandEnabled(IDC_ZOOM_MENU, true);
   command_updater_.UpdateCommandEnabled(IDC_ZOOM_PLUS, true);
   command_updater_.UpdateCommandEnabled(IDC_ZOOM_NORMAL, false);
   command_updater_.UpdateCommandEnabled(IDC_ZOOM_MINUS, true);
 
   // Show various bits of UI
-  const bool guest_session = profile()->IsGuestSession();
+  const bool guest_session = profile()->IsGuestSession() ||
+                             profile()->IsSystemProfile();
+  DCHECK(!profile()->IsSystemProfile())
+      << "Ought to never have browser for the system profile.";
   const bool normal_window = browser_->is_type_tabbed();
   UpdateOpenFileState(&command_updater_);
   command_updater_.UpdateCommandEnabled(IDC_CREATE_SHORTCUTS, false);
   UpdateCommandsForDevTools();
   command_updater_.UpdateCommandEnabled(IDC_TASK_MANAGER, CanOpenTaskManager());
   command_updater_.UpdateCommandEnabled(IDC_SHOW_HISTORY, !guest_session);
   command_updater_.UpdateCommandEnabled(IDC_SHOW_DOWNLOADS, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_MENU, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_PAGE_VIA_KEYBOARD, true);
   command_updater_.UpdateCommandEnabled(IDC_HELP_PAGE_VIA_MENU, true);
@@ skipping 218 matching lines @@
                                         CanBookmarkAllTabs(browser_));
 #if defined(OS_WIN)
   command_updater_.UpdateCommandEnabled(IDC_PIN_TO_START_SCREEN, true);
 #endif
 }
 
 void BrowserCommandController::UpdateCommandsForBookmarkBar() {
   command_updater_.UpdateCommandEnabled(
       IDC_SHOW_BOOKMARK_BAR,
       browser_defaults::bookmarks_enabled && !profile()->IsGuestSession() &&
+          !profile()->IsSystemProfile() &&
           !profile()->GetPrefs()->IsManagedPreference(
               bookmarks::prefs::kShowBookmarkBar) &&
           IsShowingMainUI());
 }
 
 void BrowserCommandController::UpdateCommandsForFileSelectionDialogs() {
   UpdateSaveAsState();
   UpdateOpenFileState(&command_updater_);
 }
 
@@ skipping 151 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome