Disable extensions besides externally installed ones and themes.

chrome/browser/views/frame/browser_view.cc

 // Copyright (c) 2006-2009 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/views/frame/browser_view.h"
 
 #if defined(OS_LINUX)
 #include <gtk/gtk.h>
 #endif
 
@@ skipping 1394 matching lines @@
 
   infobar_container_ = new InfoBarContainer(this);
   AddChildView(infobar_container_);
 
   contents_container_ = new TabContentsContainer;
   set_contents_view(contents_container_);
   AddChildView(contents_container_);
 
   status_bubble_.reset(new StatusBubbleViews(GetWidget()));
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableExtensions)) {
-    extension_shelf_ = new ExtensionShelf(browser_.get());
-    AddChildView(extension_shelf_);
-  }
+  extension_shelf_ = new ExtensionShelf(browser_.get());
+  AddChildView(extension_shelf_);
 
 #if defined(OS_WIN)
   InitSystemMenu();
 #endif
 }
 
 #if defined(OS_WIN)
 void BrowserView::InitSystemMenu() {
   system_menu_contents_.reset(new views::SystemMenuModel(this));
   // We add the menu items in reverse order so that insertion_index never needs
@@ skipping 384 matching lines @@
 
 // static
 FindBar* BrowserWindow::CreateFindBar(Browser* browser) {
   return browser::CreateFindBar(static_cast<BrowserView*>(browser->window()));
 }
 
 // static
 void BrowserList::AllBrowsersClosed() {
   views::Window::CloseAllSecondaryWindows();
 }