[Experiment, do not commit] Try not using WebUI for extensions w/o bindings.

chrome/browser/ui/webui/chrome_web_ui_controller_factory.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/webui/chrome_web_ui_controller_factory.h"
 
 #include <stddef.h>
 
 #include <vector>
 
@@ skipping 262 matching lines @@
 WebUIController* NewWebUI<WelcomeUI>(WebUI* web_ui, const GURL& url) {
   return new WelcomeUI(web_ui, url);
 }
 #endif  // !defined(OS_CHROMEOS)
 #endif  // !defined(OS_ANDROID)
 
 #if defined(ENABLE_EXTENSIONS)
 // Only create ExtensionWebUI for URLs that are allowed extension bindings,
 // hosted by actual tabs.
 bool NeedsExtensionWebUI(Profile* profile, const GURL& url) {
-  if (!profile)
-    return false;
-
-  const extensions::Extension* extension =
-      extensions::ExtensionRegistry::Get(profile)->enabled_extensions().
-          GetExtensionOrAppByURL(url);
-  // Allow bindings for all packaged extensions and component hosted apps.
-  return extension &&
-      (!extension->is_hosted_app() ||
-       extension->location() == extensions::Manifest::COMPONENT);
+  return false;
 }
 #endif
 
 bool IsAboutUI(const GURL& url) {
   return (url.host() == chrome::kChromeUIChromeURLsHost ||
           url.host() == chrome::kChromeUICreditsHost ||
           url.host() == chrome::kChromeUIDNSHost
 #if !defined(OS_ANDROID)
           || url.host() == chrome::kChromeUITermsHost
 #endif
@@ skipping 532 matching lines @@
 #endif
 
   // Android doesn't use the plugins pages.
   if (page_url.host() == chrome::kChromeUIPluginsHost)
     return PluginsUI::GetFaviconResourceBytes(scale_factor);
 
 #endif
 
   return NULL;
 }