Ensure ExtensionHost sets the RendererPrefs for its TabContents. This fixes a

chrome/browser/extensions/extension_host.cc

 // Copyright (c) 2011 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 "base/bind.h"
 #include "base/memory/singleton.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_shutdown.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/ui/app_modal_dialogs/message_box_handler.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_view_type.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_constants.h"
@@ skipping 97 matching lines @@
       ALLOW_THIS_IN_INITIALIZER_LIST(
           extension_function_dispatcher_(profile_, this)),
       extension_host_type_(host_type),
       associated_tab_contents_(NULL) {
   host_contents_.reset(new TabContents(
       profile_, site_instance, MSG_ROUTING_NONE, NULL, NULL));
   TabContentsObserver::Observe(host_contents_.get());
   host_contents_->set_delegate(this);
   host_contents_->set_view_type(host_type);
 
+  // TODO(mpcomplete): This was lifted from PrefsTabHelper, but it might be
+  // better to reuse all of PrefsTabHelper. We'd first have to make it not
+  // depend on TabContentsWrapper.
+  renderer_preferences_util::UpdateFromSystemSettings(
+      host_contents_->GetMutableRendererPrefs(), profile_);
+
   render_view_host_ = host_contents_->render_view_host();
 
   // Listen for when an extension is unloaded from the same profile, as it may
   // be the same extension that this points to.
   registrar_.Add(this, chrome::NOTIFICATION_EXTENSION_UNLOADED,
                  content::Source<Profile>(profile_));
 }
 
 // This "mock" constructor should only be used by unit tests.
 ExtensionHost::ExtensionHost(const Extension* extension,
@@ skipping 370 matching lines @@
   browser->AddTabContents(contents, disposition, initial_pos, user_gesture);
 }
 
 
 void ExtensionHost::RenderViewReady() {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_EXTENSION_HOST_CREATED,
       content::Source<Profile>(profile_),
       content::Details<ExtensionHost>(this));
 }