First cut at custom user style sheets.

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2010 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/extensions/extension_host.h"
 
 #include <list>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 451 matching lines @@
   }
 }
 
 RendererPreferences ExtensionHost::GetRendererPrefs(Profile* profile) const {
   RendererPreferences preferences;
   renderer_preferences_util::UpdateFromSystemSettings(&preferences, profile);
   return preferences;
 }
 
 WebPreferences ExtensionHost::GetWebkitPrefs() {
-  PrefService* prefs = render_view_host()->process()->profile()->GetPrefs();
+  Profile* profile = render_view_host()->process()->profile();
   const bool kIsDomUI = true;
   WebPreferences webkit_prefs =
-      RenderViewHostDelegateHelper::GetWebkitPrefs(prefs, kIsDomUI);
+      RenderViewHostDelegateHelper::GetWebkitPrefs(profile, kIsDomUI);
   if (extension_host_type_ == ViewType::EXTENSION_POPUP)
     webkit_prefs.allow_scripts_to_close_windows = true;
   return webkit_prefs;
 }
 
 void ExtensionHost::ProcessDOMUIMessage(const std::string& message,
                                         const Value* content,
                                         int request_id,
                                         bool has_callback) {
   if (extension_function_dispatcher_.get()) {
@@ skipping 204 matching lines @@
     // Extensions hosted in ExternalTabContainer objects may not have
     // an associated browser.
     Browser* browser = GetBrowser();
     if (browser)
       window_id = ExtensionTabUtil::GetWindowId(browser);
   } else if (extension_host_type_ != ViewType::EXTENSION_BACKGROUND_PAGE) {
     NOTREACHED();
   }
   return window_id;
 }