Introduce per-tab preferences service.

chrome/browser/ui/tab_contents/tab_contents_wrapper.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/ui/tab_contents/tab_contents_wrapper.h"
 
 #include "base/utf_string_conversions.h"
 
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
@@ skipping 287 matching lines @@
   translate_tab_helper_.reset(new TranslateTabHelper(contents));
   web_intent_picker_controller_.reset(new WebIntentPickerController(
       this, new WebIntentPickerFactoryImpl()));
 
   // Create the per-tab observers.
   download_request_limiter_observer_.reset(
       new DownloadRequestLimiterObserver(contents));
   webnavigation_observer_.reset(
       new ExtensionWebNavigationTabObserver(contents));
   external_protocol_observer_.reset(new ExternalProtocolObserver(contents));
+  per_tab_prefs_.reset(
+      profile()->GetPrefs()->CreatePrefServiceWithPerTabPrefStore());
   plugin_observer_.reset(new PluginObserver(this));
   print_preview_.reset(new printing::PrintPreviewMessageHandler(contents));
   sad_tab_observer_.reset(new SadTabObserver(contents));
   // Start the in-browser thumbnailing if the feature is enabled.
   if (switches::IsInBrowserThumbnailingEnabled()) {
     thumbnail_generation_observer_.reset(new ThumbnailGenerator);
     thumbnail_generation_observer_->StartThumbnailing(tab_contents_.get());
   }
 
   // Set-up the showing of the omnibox search infobar if applicable.
@@ skipping 395 matching lines @@
   render_view_host()->Send(
       new ChromeViewMsg_SetClientSidePhishingDetection(routing_id(),
                                                        safe_browsing));
 #endif
 }
 
 void TabContentsWrapper::ExitFullscreenMode() {
   if (tab_contents() && render_view_host())
     tab_contents()->render_view_host()->ExitFullscreen();
 }