Store plug-in enabled/disabled state in PluginPrefs instead of WebPluginInfo.

chrome/browser/plugin_prefs.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/plugin_prefs.h"
 
 #include <string>
 
 #include "base/command_line.h"
+#include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
+#include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "base/version.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 #include "chrome/common/chrome_content_client.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
 #include "content/browser/browser_thread.h"
 #include "content/common/notification_service.h"
+#include "webkit/plugins/npapi/plugin_group.h"
 #include "webkit/plugins/npapi/plugin_list.h"
 #include "webkit/plugins/webplugininfo.h"
 
 namespace {
 
 class PluginPrefsWrapper : public ProfileKeyedService {
  public:
   explicit PluginPrefsWrapper(scoped_refptr<PluginPrefs> plugin_prefs)
       : plugin_prefs_(plugin_prefs) {}
   virtual ~PluginPrefsWrapper() {}
 
   PluginPrefs* plugin_prefs() { return plugin_prefs_.get(); }
 
  private:
   // ProfileKeyedService methods:
   virtual void Shutdown() OVERRIDE {
     plugin_prefs_->ShutdownOnUIThread();
   }
 
   scoped_refptr<PluginPrefs> plugin_prefs_;
 };
 
+// Default state for a plug-in (not state of the default plug-in!).
+base::LazyInstance<base::Lock> g_default_state_lock(base::LINKER_INITIALIZED);
+base::LazyInstance<std::map<FilePath, bool> > g_default_plugin_state(
+    base::LINKER_INITIALIZED);
+
 }
 
 // How long to wait to save the plugin enabled information, which might need to
 // go to disk.
 #define kPluginUpdateDelayMs (60 * 1000)
 
 class PluginPrefs::Factory : public ProfileKeyedServiceFactory {
  public:
   static Factory* GetInstance();
 
@@ skipping 19 matching lines @@
 }
 
 // static
 PluginPrefs* PluginPrefs::GetForProfile(Profile* profile) {
   PluginPrefs* plugin_prefs =
       Factory::GetInstance()->GetWrapperForProfile(profile)->plugin_prefs();
   DCHECK(plugin_prefs);
   return plugin_prefs;
 }
 
-DictionaryValue* PluginPrefs::CreatePluginFileSummary(
-    const webkit::WebPluginInfo& plugin) {
-  DictionaryValue* data = new DictionaryValue();
-  data->SetString("path", plugin.path.value());
-  data->SetString("name", plugin.name);
-  data->SetString("version", plugin.version);
-  data->SetBoolean("enabled", IsPluginEnabled(plugin));
-  return data;
+void PluginPrefs::EnablePluginGroup(bool enabled, const string16& group_name) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+  webkit::npapi::PluginList* plugin_list =
+      webkit::npapi::PluginList::Singleton();
+  std::vector<webkit::npapi::PluginGroup> groups;
+  plugin_list->GetPluginGroups(true, &groups);
+
+  base::AutoLock auto_lock(lock_);
+
+  // Set the desired state for the group.
+  plugin_group_state_[group_name] = enabled;
+
+  // Update the state for all plug-ins in the group.
+  for (size_t i = 0; i < groups.size(); ++i) {
+    if (groups[i].GetGroupName() != group_name)
+      continue;
+    const std::vector<webkit::WebPluginInfo>& plugins =
+        groups[i].web_plugin_infos();
+    for (size_t j = 0; j < plugins.size(); ++j)
+      plugin_state_[plugins[j].path] = enabled;
+    break;
+  }
+
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &PluginPrefs::OnUpdatePreferences, groups));
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &PluginPrefs::NotifyPluginStatusChanged));
 }
 
-void PluginPrefs::EnablePluginGroup(bool enable, const string16& group_name) {
-  webkit::npapi::PluginList::Singleton()->EnableGroup(enable, group_name);
-  NotifyPluginStatusChanged();
+void PluginPrefs::EnablePlugin(bool enabled, const FilePath& path) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
+
+  {
+    // Set the desired state for the plug-in.
+    base::AutoLock auto_lock(lock_);
+    plugin_state_[path] = enabled;
+  }
+
+  webkit::npapi::PluginList* plugin_list =
+      webkit::npapi::PluginList::Singleton();
+  std::vector<webkit::npapi::PluginGroup> groups;
+  plugin_list->GetPluginGroups(true, &groups);
+
+  bool found_group = false;
+  for (size_t i = 0; i < groups.size(); ++i) {
+    bool all_disabled = true;
+    const std::vector<webkit::WebPluginInfo>& plugins =
+        groups[i].web_plugin_infos();
+    for (size_t j = 0; j < plugins.size(); ++j) {
+      all_disabled = all_disabled && !IsPluginEnabled(plugins[j]);
+      if (plugins[j].path == path) {
+        found_group = true;
+        DCHECK_EQ(enabled, IsPluginEnabled(plugins[j]));
+      }
+    }
+    if (found_group) {
+      // Update the state for the corresponding plug-in group.
+      base::AutoLock auto_lock(lock_);
+      plugin_group_state_[groups[i].GetGroupName()] = !all_disabled;
+      break;
+    }
+  }
+
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &PluginPrefs::OnUpdatePreferences, groups));
+  BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
+      NewRunnableMethod(this, &PluginPrefs::NotifyPluginStatusChanged));
 }
 
-void PluginPrefs::EnablePlugin(bool enable, const FilePath& path) {
-  if (enable)
-    webkit::npapi::PluginList::Singleton()->EnablePlugin(path);
-  else
-    webkit::npapi::PluginList::Singleton()->DisablePlugin(path);
+// static
+void PluginPrefs::EnablePluginDefault(bool enable, const FilePath& file_path) {
+  base::AutoLock lock(g_default_state_lock.Get());
+  g_default_plugin_state.Get()[file_path] = enable;
+}
 
-  NotifyPluginStatusChanged();
+PluginPrefs::PolicyStatus PluginPrefs::PolicyStatusForPlugin(
+    const string16& name) {
+  base::AutoLock auto_lock(lock_);

[Joao da Silva, 2011/09/13 09:30:48]

The lock is acquired when reading here, but isn't acquired when
|policy_*_patterns_| is written below.

[Bernhard Bauer, 2011/09/13 12:13:01]

Added a lock in |Observe|.

+  if (IsStringMatchedInSet(name, policy_enabled_plugin_patterns_)) {
+    return POLICY_ENABLED;
+  } else if (IsStringMatchedInSet(name, policy_disabled_plugin_patterns_) &&
+             !IsStringMatchedInSet(
+                 name, policy_disabled_plugin_exception_patterns_)) {
+    return POLICY_DISABLED;
+  } else {
+    return NO_POLICY;
+  }
 }
 
 bool PluginPrefs::IsPluginEnabled(const webkit::WebPluginInfo& plugin) {
+  scoped_ptr<webkit::npapi::PluginGroup> group(
+      webkit::npapi::PluginList::Singleton()->GetPluginGroup(plugin));
+  string16 group_name = group->GetGroupName();
+
+  // Check if the plug-in or its group is enabled by policy.
+  PolicyStatus plugin_status = PolicyStatusForPlugin(plugin.name);
+  PolicyStatus group_status = PolicyStatusForPlugin(group_name);
+  if (plugin_status == POLICY_ENABLED || group_status == POLICY_ENABLED)
+    return true;
+
+  // Check if the plug-in or its group is disabled by policy.
+  if (plugin_status == POLICY_DISABLED || group_status == POLICY_DISABLED)
+    return false;
+
   // If enabling NaCl, make sure the plugin is also enabled. See bug
   // http://code.google.com/p/chromium/issues/detail?id=81010 for more
   // information.
   // TODO(dspringer): When NaCl is on by default, remove this code.
   if ((plugin.name ==
        ASCIIToUTF16(chrome::ChromeContentClient::kNaClPluginName)) &&
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableNaCl)) {
     return true;
   }
-  return webkit::IsPluginEnabled(plugin);
+
+  base::AutoLock auto_lock(lock_);
+  // Check user preferences for the plug-in.
+  std::map<FilePath, bool>::iterator plugin_it =
+      plugin_state_.find(plugin.path);
+  if (plugin_it != plugin_state_.end())
+    return plugin_it->second;
+
+  // Check user preferences for the plug-in group.
+  std::map<string16, bool>::iterator group_it(
+      plugin_group_state_.find(plugin.name));
+  if (group_it != plugin_group_state_.end())
+    return group_it->second;
+
+  base::AutoLock default_lock(g_default_state_lock.Get());
+  std::map<FilePath, bool>::iterator defaults_it =
+      g_default_plugin_state.Get().find(plugin.path);
+  if (defaults_it != g_default_plugin_state.Get().end())
+    return defaults_it->second;
+
+  // Default to enabled.
+  return true;
 }
 
 void PluginPrefs::Observe(int type,
-                            const NotificationSource& source,
-                            const NotificationDetails& details) {
+                          const NotificationSource& source,
+                          const NotificationDetails& details) {
   DCHECK_EQ(chrome::NOTIFICATION_PREF_CHANGED, type);
   const std::string* pref_name = Details<std::string>(details).ptr();
   if (!pref_name) {
     NOTREACHED();
     return;
   }
   DCHECK_EQ(prefs_, Source<PrefService>(source).ptr());
-  if (*pref_name == prefs::kPluginsDisabledPlugins ||
-      *pref_name == prefs::kPluginsDisabledPluginsExceptions ||
-      *pref_name == prefs::kPluginsEnabledPlugins) {
-    const ListValue* disabled_list =
-        prefs_->GetList(prefs::kPluginsDisabledPlugins);
-    const ListValue* exceptions_list =
-        prefs_->GetList(prefs::kPluginsDisabledPluginsExceptions);
-    const ListValue* enabled_list =
-        prefs_->GetList(prefs::kPluginsEnabledPlugins);
-    UpdatePluginsStateFromPolicy(disabled_list, exceptions_list, enabled_list);
+  if (*pref_name == prefs::kPluginsDisabledPlugins) {
+    ListValueToStringSet(prefs_->GetList(prefs::kPluginsDisabledPlugins),
+                         &policy_disabled_plugin_patterns_);
+  } else if (*pref_name == prefs::kPluginsDisabledPluginsExceptions) {
+    ListValueToStringSet(
+        prefs_->GetList(prefs::kPluginsDisabledPluginsExceptions),
+        &policy_disabled_plugin_exception_patterns_);
+  } else if (*pref_name == prefs::kPluginsEnabledPlugins) {
+    ListValueToStringSet(prefs_->GetList(prefs::kPluginsEnabledPlugins),
+                         &policy_enabled_plugin_patterns_);
+  } else {
+    NOTREACHED();
   }
-}
-
-void PluginPrefs::UpdatePluginsStateFromPolicy(
-    const ListValue* disabled_list,
-    const ListValue* exceptions_list,
-    const ListValue* enabled_list) {
-  std::set<string16> disabled_plugin_patterns;
-  std::set<string16> disabled_plugin_exception_patterns;
-  std::set<string16> enabled_plugin_patterns;
-
-  ListValueToStringSet(disabled_list, &disabled_plugin_patterns);
-  ListValueToStringSet(exceptions_list, &disabled_plugin_exception_patterns);
-  ListValueToStringSet(enabled_list, &enabled_plugin_patterns);
-
-  webkit::npapi::PluginGroup::SetPolicyEnforcedPluginPatterns(
-      disabled_plugin_patterns,
-      disabled_plugin_exception_patterns,
-      enabled_plugin_patterns);
-
   NotifyPluginStatusChanged();
 }
 
+/*static*/
+bool PluginPrefs::IsStringMatchedInSet(const string16& name,
+                                       const std::set<string16>& pattern_set) {
+  std::set<string16>::const_iterator pattern(pattern_set.begin());
+  while (pattern != pattern_set.end()) {
+    if (MatchPattern(name, *pattern))
+      return true;
+    ++pattern;
+  }
+
+  return false;
+}
+
+/* static */
 void PluginPrefs::ListValueToStringSet(const ListValue* src,
                                        std::set<string16>* dest) {
   DCHECK(src);
   DCHECK(dest);
   ListValue::const_iterator end(src->end());
   for (ListValue::const_iterator current(src->begin());
        current != end; ++current) {
     string16 plugin_name;
     if ((*current)->GetAsString(&plugin_name)) {
       dest->insert(plugin_name);
@@ skipping 88 matching lines @@
             }
 
             internal_pdf_enabled = enabled;
           } else if (FilePath::CompareIgnoreCase(path, nacl_path_str) == 0) {
             if (!enabled && force_enable_nacl) {
               enabled = true;
               plugin->SetBoolean("enabled", true);
             }
           }
 
-          if (!enabled)
-            webkit::npapi::PluginList::Singleton()->DisablePlugin(plugin_path);
+          plugin_state_[plugin_path] = enabled;
         } else if (!enabled && plugin->GetString("name", &group_name)) {
           // Don't disable this group if it's for the pdf or nacl plugins and
           // we just forced it on.
           if (force_enable_internal_pdf && pdf_group_name == group_name)
             continue;
           if (force_enable_nacl && (nacl_group_name == group_name ||
                                     old_nacl_group_name == group_name))
             continue;
 
           // Otherwise this is a list of groups.
-          EnablePluginGroup(false, group_name);
+          plugin_group_state_[group_name] = false;
         }
       }
     } else {
       // If the saved plugin list is empty, then the call to UpdatePreferences()
       // below failed in an earlier run, possibly because the user closed the
       // browser too quickly. Try to force enable the internal PDF and nacl
       // plugins again.
       force_enable_internal_pdf = true;
       force_enable_nacl = true;
     }
   }  // Scoped update of prefs::kPluginsPluginsList.
 
   // Build the set of policy enabled/disabled plugin patterns once and cache it.
   // Don't do this in the constructor, there's no profile available there.
-  const ListValue* disabled_plugins =
-      prefs_->GetList(prefs::kPluginsDisabledPlugins);
-  const ListValue* disabled_exception_plugins =
-      prefs_->GetList(prefs::kPluginsDisabledPluginsExceptions);
-  const ListValue* enabled_plugins =
-      prefs_->GetList(prefs::kPluginsEnabledPlugins);
-  UpdatePluginsStateFromPolicy(disabled_plugins,
-                               disabled_exception_plugins,
-                               enabled_plugins);
+  ListValueToStringSet(prefs_->GetList(prefs::kPluginsDisabledPlugins),
+                       &policy_disabled_plugin_patterns_);
+  ListValueToStringSet(
+      prefs_->GetList(prefs::kPluginsDisabledPluginsExceptions),
+      &policy_disabled_plugin_exception_patterns_);
+  ListValueToStringSet(prefs_->GetList(prefs::kPluginsEnabledPlugins),
+                       &policy_enabled_plugin_patterns_);
 
-  registrar_.RemoveAll();
   registrar_.Init(prefs_);
   registrar_.Add(prefs::kPluginsDisabledPlugins, this);
   registrar_.Add(prefs::kPluginsDisabledPluginsExceptions, this);
   registrar_.Add(prefs::kPluginsEnabledPlugins, this);
 
   if (force_enable_internal_pdf || internal_pdf_enabled) {
     // See http://crbug.com/50105 for background.
-    EnablePluginGroup(false, ASCIIToUTF16(
-        webkit::npapi::PluginGroup::kAdobeReaderGroupName));
+    plugin_group_state_[ASCIIToUTF16(
+        webkit::npapi::PluginGroup::kAdobeReaderGroupName)] = false;
   }
 
   if (force_enable_internal_pdf || force_enable_nacl) {
     // We want to save this, but doing so requires loading the list of plugins,
     // so do it after a minute as to not impact startup performance.  Note that
     // plugins are loaded after 30s by the metrics service.
-    UpdatePreferences(kPluginUpdateDelayMs);
+    BrowserThread::PostDelayedTask(
+        BrowserThread::FILE,
+        FROM_HERE,
+        NewRunnableMethod(this, &PluginPrefs::GetPreferencesDataOnFileThread),
+        kPluginUpdateDelayMs);
   }
+
+  NotifyPluginStatusChanged();
 }
 
 void PluginPrefs::ShutdownOnUIThread() {
   prefs_ = NULL;
   registrar_.RemoveAll();
 }
 
 // static
 PluginPrefs::Factory* PluginPrefs::Factory::GetInstance() {
   return Singleton<PluginPrefs::Factory>::get();
 }
 
 PluginPrefsWrapper* PluginPrefs::Factory::GetWrapperForProfile(
     Profile* profile) {
   return static_cast<PluginPrefsWrapper*>(GetServiceForProfile(profile, true));
 }
 
 PluginPrefs::Factory::Factory()
     : ProfileKeyedServiceFactory(ProfileDependencyManager::GetInstance()) {
 }
 
 ProfileKeyedService* PluginPrefs::Factory::BuildServiceInstanceFor(
       Profile* profile) const {
   scoped_refptr<PluginPrefs> plugin_prefs(new PluginPrefs());
   plugin_prefs->SetPrefs(profile->GetPrefs());
   return new PluginPrefsWrapper(plugin_prefs);
 }
 
-PluginPrefs::PluginPrefs() : notify_pending_(false) {
+PluginPrefs::PluginPrefs() {
 }
 
 PluginPrefs::~PluginPrefs() {
 }
 
-void PluginPrefs::UpdatePreferences(int delay_ms) {
-  BrowserThread::PostDelayedTask(
-      BrowserThread::FILE,
-      FROM_HERE,
-      NewRunnableMethod(this, &PluginPrefs::GetPreferencesDataOnFileThread),
-      delay_ms);
+void PluginPrefs::SetPolicyEnforcedPluginPatterns(
+    const std::set<string16>& disabled_patterns,
+    const std::set<string16>& disabled_exception_patterns,
+    const std::set<string16>& enabled_patterns) {
+  policy_disabled_plugin_patterns_ = disabled_patterns;
+  policy_disabled_plugin_exception_patterns_ = disabled_exception_patterns;
+  policy_enabled_plugin_patterns_ = enabled_patterns;
 }
 
 void PluginPrefs::GetPreferencesDataOnFileThread() {
-  std::vector<webkit::WebPluginInfo> plugins;
   std::vector<webkit::npapi::PluginGroup> groups;
 
   webkit::npapi::PluginList* plugin_list =
       webkit::npapi::PluginList::Singleton();
-  plugin_list->GetPlugins(&plugins);
   plugin_list->GetPluginGroups(false, &groups);
 
   BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
-      NewRunnableMethod(this, &PluginPrefs::OnUpdatePreferences,
-                        plugins, groups));
+      NewRunnableMethod(this, &PluginPrefs::OnUpdatePreferences, groups));
 }
 
 void PluginPrefs::OnUpdatePreferences(
-    std::vector<webkit::WebPluginInfo> plugins,
     std::vector<webkit::npapi::PluginGroup> groups) {
   if (!prefs_)
     return;
 
   ListPrefUpdate update(prefs_, prefs::kPluginsPluginsList);
   ListValue* plugins_list = update.Get();
   plugins_list->Clear();
 
   FilePath internal_dir;
   if (PathService::Get(chrome::DIR_INTERNAL_PLUGINS, &internal_dir))
     prefs_->SetFilePath(prefs::kPluginsLastInternalDirectory, internal_dir);
 
-  // Add the plugin files.
-  for (size_t i = 0; i < plugins.size(); ++i) {
-    DictionaryValue* summary = CreatePluginFileSummary(plugins[i]);
-    // If the plugin is managed by policy, store the user preferred state
-    // instead.
-    if (plugins[i].enabled & webkit::WebPluginInfo::MANAGED_MASK) {
-      bool user_enabled =
-          (plugins[i].enabled & webkit::WebPluginInfo::USER_MASK) ==
-              webkit::WebPluginInfo::USER_ENABLED;
-      summary->SetBoolean("enabled", user_enabled);
+  base::AutoLock auto_lock(lock_);
+
+  // Add the plug-in groups.
+  for (size_t i = 0; i < groups.size(); ++i) {
+    // Add the plugin files to the same list.
+    const std::vector<webkit::WebPluginInfo>& plugins =
+        groups[i].web_plugin_infos();
+    for (size_t j = 0; j < plugins.size(); ++j) {
+      DictionaryValue* summary = new DictionaryValue();
+      summary->SetString("path", plugins[j].path.value());
+      summary->SetString("name", plugins[j].name);
+      summary->SetString("version", plugins[j].version);
+      bool enabled = true;
+      std::map<FilePath, bool>::iterator it =
+          plugin_state_.find(plugins[j].path);
+      if (it != plugin_state_.end())
+        enabled = it->second;
+      summary->SetBoolean("enabled", enabled);
+      plugins_list->Append(summary);
     }
+
+    DictionaryValue* summary = new DictionaryValue();
+    string16 name = groups[i].GetGroupName();
+    summary->SetString("name", name);
+    bool enabled = true;
+    std::map<string16, bool>::iterator it =
+        plugin_group_state_.find(name);
+    if (it != plugin_group_state_.end())
+      enabled = it->second;
+    summary->SetBoolean("enabled", enabled);
     plugins_list->Append(summary);
   }
-
-  // Add the groups as well.
-  for (size_t i = 0; i < groups.size(); ++i) {
-      DictionaryValue* summary = groups[i].GetSummary();
-      // If the plugin is disabled only by policy don't store this state in the
-      // user pref store.
-      if (!groups[i].Enabled() &&
-          webkit::npapi::PluginGroup::IsPluginNameDisabledByPolicy(
-              groups[i].GetGroupName()))
-        summary->SetBoolean("enabled", true);
-      plugins_list->Append(summary);
-  }
 }
 
 void PluginPrefs::NotifyPluginStatusChanged() {
-  if (notify_pending_)
-    return;
-  notify_pending_ = true;
-  MessageLoop::current()->PostTask(
-      FROM_HERE,
-      NewRunnableMethod(this, &PluginPrefs::OnNotifyPluginStatusChanged));
-}
-
-void PluginPrefs::OnNotifyPluginStatusChanged() {
-  notify_pending_ = false;
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   NotificationService::current()->Notify(
       chrome::NOTIFICATION_PLUGIN_ENABLE_STATUS_CHANGED,
       Source<PluginPrefs>(this),
       NotificationService::NoDetails());
 }
 
 /*static*/
 void PluginPrefs::RegisterPrefs(PrefService* prefs) {
   FilePath internal_dir;
   PathService::Get(chrome::DIR_INTERNAL_PLUGINS, &internal_dir);
   prefs->RegisterFilePathPref(prefs::kPluginsLastInternalDirectory,
                               internal_dir,
                               PrefService::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kPluginsEnabledInternalPDF,
                              false,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterBooleanPref(prefs::kPluginsEnabledNaCl,
                              false,
                              PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kPluginsPluginsList,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kPluginsDisabledPlugins,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kPluginsDisabledPluginsExceptions,
                           PrefService::UNSYNCABLE_PREF);
   prefs->RegisterListPref(prefs::kPluginsEnabledPlugins,
                           PrefService::UNSYNCABLE_PREF);
 }