Add a policy to re-enable deprecated web platform features.

chrome/browser/ui/prefs/prefs_tab_helper.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/prefs/prefs_tab_helper.h"
 
 #include <string>
 
 #include "base/prefs/overlay_user_pref_store.h"
 #include "base/prefs/pref_service.h"
@@ skipping 280 matching lines @@
       weak_ptr_factory_(this) {
   PrefService* prefs = GetProfile()->GetPrefs();
   pref_change_registrar_.Init(prefs);
   if (prefs) {
     base::Closure renderer_callback = base::Bind(
         &PrefsTabHelper::UpdateRendererPreferences, base::Unretained(this));
     pref_change_registrar_.Add(prefs::kAcceptLanguages, renderer_callback);
     pref_change_registrar_.Add(prefs::kDefaultZoomLevel, renderer_callback);
     pref_change_registrar_.Add(prefs::kEnableDoNotTrack, renderer_callback);
     pref_change_registrar_.Add(prefs::kEnableReferrers, renderer_callback);
+    pref_change_registrar_.Add(prefs::kEnableDeprecatedWebPlatformFeatures,
+                               renderer_callback);
 
 #if !defined(OS_MACOSX)
     pref_change_registrar_.Add(prefs::kFullscreenAllowed, renderer_callback);
 #endif
 
     PrefChangeRegistrar::NamedChangeCallback webkit_callback = base::Bind(
         &PrefsTabHelper::OnWebPrefChanged, base::Unretained(this));
     for (int i = 0; i < kPrefsToObserveLength; ++i) {
       const char* pref_name = kPrefsToObserve[i];
       DCHECK(std::string(pref_name) == prefs::kDefaultCharset ||
@@ skipping 131 matching lines @@
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
   registry->RegisterLocalizedStringPref(
       prefs::kAcceptLanguages,
       IDS_ACCEPT_LANGUAGES,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
   registry->RegisterLocalizedStringPref(
       prefs::kDefaultCharset,
       IDS_DEFAULT_ENCODING,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);
+  registry->RegisterListPref(
+      prefs::kEnableDeprecatedWebPlatformFeatures,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 
   // Register font prefs that have defaults.
   std::set<std::string> fonts_with_defaults;
   UScriptCode browser_script = GetScriptOfBrowserLocale();
   for (size_t i = 0; i < kFontDefaultsLength; ++i) {
     const FontDefault& pref = kFontDefaults[i];
     UScriptCode pref_script = GetScriptOfFontPref(pref.pref_name);
 
     // Suppress this default font pref value if it is for the primary script of
     // the browser's UI locale.  For example, if the pref is for the sans-serif
@@ skipping 110 matching lines @@
       WebPreferences web_prefs =
           web_contents_->GetRenderViewHost()->GetWebkitPreferences();
       OverrideFontFamily(&web_prefs, generic_family, script, std::string());
       web_contents_->GetRenderViewHost()->UpdateWebkitPreferences(web_prefs);
       return;
     }
   }
 
   UpdateWebPreferences();
 }