Add content_settings::PrefProvider to HostContentSettingsMap.

chrome/browser/content_settings/host_content_settings_map.cc

Index: chrome/browser/content_settings/host_content_settings_map.cc
diff --git a/chrome/browser/content_settings/host_content_settings_map.cc b/chrome/browser/content_settings/host_content_settings_map.cc
index 2077066c56215b32c5f66045b4147fc1d90586aa..48a61de991d2e7bb719bb3987490d746a7ce7979 100644
--- a/chrome/browser/content_settings/host_content_settings_map.cc
+++ b/chrome/browser/content_settings/host_content_settings_map.cc
@@ -28,41 +28,6 @@
 
 namespace {
 
-// The preference keys where resource identifiers are stored for
-// ContentSettingsType values that support resource identifiers.
-const char* kResourceTypeNames[CONTENT_SETTINGS_NUM_TYPES] = {
-  NULL,
-  NULL,
-  NULL,
-  "per_plugin",
-  NULL,
-  NULL,  // Not used for Geolocation
-  NULL,  // Not used for Notifications
-};
-
-// The names of the ContentSettingsType values, for use with dictionary prefs.
-const char* kTypeNames[CONTENT_SETTINGS_NUM_TYPES] = {
-  "cookies",
-  "images",
-  "javascript",
-  "plugins",
-  "popups",
-  NULL,  // Not used for Geolocation
-  NULL,  // Not used for Notifications
-};
-
-// True if a given content settings type requires additional resource
-// identifiers.
-const bool kRequiresResourceIdentifier[CONTENT_SETTINGS_NUM_TYPES] = {
-  false,  // CONTENT_SETTINGS_TYPE_COOKIES
-  false,  // CONTENT_SETTINGS_TYPE_IMAGES
-  false,  // CONTENT_SETTINGS_TYPE_JAVASCRIPT
-  true,   // CONTENT_SETTINGS_TYPE_PLUGINS
-  false,  // CONTENT_SETTINGS_TYPE_POPUPS
-  false,  // Not used for Geolocation
-  false,  // Not used for Notifications
-};
-
 // Returns true if we should allow all content types for this URL.  This is
 // true for various internal objects like chrome:// URLs, so UI and other
 // things users think of as "not webpages" don't break.
@@ -75,33 +40,24 @@ static bool ShouldAllowAllContent(const GURL& url) {
          url.SchemeIs(chrome::kUserScriptScheme);
 }
 
-// Map ASK for the plugins content type to BLOCK if click-to-play is
-// not enabled.
-ContentSetting ClickToPlayFixup(ContentSettingsType content_type,
-                                ContentSetting setting) {
-  if (setting == CONTENT_SETTING_ASK &&
-      content_type == CONTENT_SETTINGS_TYPE_PLUGINS &&
-      !CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableClickToPlay)) {
-    return CONTENT_SETTING_BLOCK;
-  }
-  return setting;
-}
-
 typedef linked_ptr<content_settings::DefaultProviderInterface>
     DefaultContentSettingsProviderPtr;
 typedef std::vector<DefaultContentSettingsProviderPtr>::iterator
-    provider_iterator;
+    DefaultProviderIterator;
 typedef std::vector<DefaultContentSettingsProviderPtr>::const_iterator
-    const_provider_iterator;
+    ConstDefaultProviderIterator;
 
-}  // namespace
+typedef linked_ptr<content_settings::ProviderInterface> ProviderPtr;
+typedef std::vector<ProviderPtr>::iterator ProviderIterator;
+typedef std::vector<ProviderPtr>::const_iterator ConstProviderIterator;
 
+typedef content_settings::ProviderInterface::Rules Rules;
+typedef content_settings::ProviderInterface::Rules::iterator
+    rules_iterator;
+typedef content_settings::ProviderInterface::Rules::const_iterator
+    const_rules_iterator;
 
-struct HostContentSettingsMap::ExtendedContentSettings {
-  ContentSettings content_settings;
-  ResourceContentSettings content_settings_for_resources;
-};
+}  // namespace
 
 HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
     : profile_(profile),
@@ -109,9 +65,9 @@ HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
       updating_preferences_(false),
       block_third_party_cookies_(false),
       is_block_third_party_cookies_managed_(false) {
-  // The order in which the content settings providers are created is critical,
-  // as providers that are further down in the list (i.e. added later) override
-  // providers further up.
+  // The order in which the default content settings providers are created is
+  // critical, as providers that are further down in the list (i.e. added later)
+  // override providers further up.
   default_content_settings_providers_.push_back(
       DefaultContentSettingsProviderPtr(
           new content_settings::PrefDefaultProvider(profile)));
@@ -121,12 +77,10 @@ HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
 
   PrefService* prefs = profile_->GetPrefs();
 
+  // TODO(markusheintz): Discuss whether it is sensible to move migration code
+  // to PrefContentSettingsProvider.
   MigrateObsoleteCookiePref(prefs);
 
-  MigrateObsoletePopupsPref(prefs);
-
-  MigrateObsoletePerhostPref(prefs);
-
   // Read misc. global settings.
   block_third_party_cookies_ =
       prefs->GetBoolean(prefs::kBlockThirdPartyCookies);
@@ -135,22 +89,14 @@ HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
   block_nonsandboxed_plugins_ =
       prefs->GetBoolean(prefs::kBlockNonsandboxedPlugins);
 
-  // Verify preferences version.
-  if (!prefs->HasPrefPath(prefs::kContentSettingsVersion)) {
-    prefs->SetInteger(prefs::kContentSettingsVersion,
-                      ContentSettingsPattern::kContentSettingsPatternVersion);
-  }
-  if (prefs->GetInteger(prefs::kContentSettingsVersion) >
-      ContentSettingsPattern::kContentSettingsPatternVersion) {
-    LOG(ERROR) << "Unknown content settings version in preferences.";
-    return;
-  }
-
-  // Read exceptions.
-  ReadExceptions(false);
+  // User defined non default content settings are provided by the PrefProvider.
+  // The order in which the content settings providers are created is critical,
+  // as providers that are further up in the list (i.e. added earlier) override
+  // providers further down.
+  content_settings_providers_.push_back(ProviderPtr(
+      new content_settings::PrefProvider(profile)));
 
   pref_change_registrar_.Init(prefs);
-  pref_change_registrar_.Add(prefs::kContentSettingsPatterns, this);
   pref_change_registrar_.Add(prefs::kBlockThirdPartyCookies, this);
   pref_change_registrar_.Add(prefs::kBlockNonsandboxedPlugins, this);
   notification_registrar_.Add(this, NotificationType::PROFILE_DESTROYED,
@@ -159,9 +105,6 @@ HostContentSettingsMap::HostContentSettingsMap(Profile* profile)
 
 // static
 void HostContentSettingsMap::RegisterUserPrefs(PrefService* prefs) {
-  prefs->RegisterIntegerPref(prefs::kContentSettingsVersion,
-      ContentSettingsPattern::kContentSettingsPatternVersion);
-  prefs->RegisterDictionaryPref(prefs::kContentSettingsPatterns);
   prefs->RegisterBooleanPref(prefs::kBlockThirdPartyCookies, false);
   prefs->RegisterBooleanPref(prefs::kBlockNonsandboxedPlugins, false);
   prefs->RegisterIntegerPref(prefs::kContentSettingsWindowLastTabIndex, 0);
@@ -169,18 +112,17 @@ void HostContentSettingsMap::RegisterUserPrefs(PrefService* prefs) {
   // Obsolete prefs, for migration:
   prefs->RegisterIntegerPref(prefs::kCookieBehavior,
                              net::StaticCookiePolicy::ALLOW_ALL_COOKIES);
-  prefs->RegisterListPref(prefs::kPopupWhitelistedHosts);
-  prefs->RegisterDictionaryPref(prefs::kPerHostContentSettings);
 
   // Register the prefs for the content settings providers.
   content_settings::PrefDefaultProvider::RegisterUserPrefs(prefs);
   content_settings::PolicyDefaultProvider::RegisterUserPrefs(prefs);
+  content_settings::PrefProvider::RegisterUserPrefs(prefs);
 }
 
 ContentSetting HostContentSettingsMap::GetDefaultContentSetting(
     ContentSettingsType content_type) const {
   ContentSetting setting = CONTENT_SETTING_DEFAULT;
-  for (const_provider_iterator provider =
+  for (ConstDefaultProviderIterator provider =
            default_content_settings_providers_.begin();
        provider != default_content_settings_providers_.end(); ++provider) {
     ContentSetting provided_setting =
@@ -216,74 +158,18 @@ ContentSetting HostContentSettingsMap::GetNonDefaultContentSetting(
   if (ShouldAllowAllContent(url))
     return CONTENT_SETTING_ALLOW;
 
-  if (!RequiresResourceIdentifier(content_type))
-    return GetNonDefaultContentSettings(url).settings[content_type];
-
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableResourceContentSettings)) {
-    DCHECK(!resource_identifier.empty());
-  }
-
-  // Host content settings are ignored if the default_content_setting is
-  // managed.
-  if (IsDefaultContentSettingManaged(content_type)) {
-    return GetDefaultContentSetting(content_type);
-  }
-
-  base::AutoLock auto_lock(lock_);
-
-  const std::string host(net::GetHostOrSpecFromURL(url));
-  ContentSettingsTypeResourceIdentifierPair
-      requested_setting(content_type, resource_identifier);
-
-  // Check for exact matches first.
-  HostContentSettings::const_iterator i(host_content_settings_.find(host));
-  if (i != host_content_settings_.end() &&
-      i->second.content_settings_for_resources.find(requested_setting) !=
-      i->second.content_settings_for_resources.end()) {
-    return i->second.content_settings_for_resources.find(
-        requested_setting)->second;
-  }
-
-  // If this map is not for an off-the-record profile, these searches will never
-  // match. The additional off-the-record exceptions always overwrite the
-  // regular ones.
-  i = off_the_record_settings_.find(host);
-  if (i != off_the_record_settings_.end() &&
-      i->second.content_settings_for_resources.find(requested_setting) !=
-      i->second.content_settings_for_resources.end()) {
-    return i->second.content_settings_for_resources.find(
-        requested_setting)->second;
-  }
-
-  // Match patterns starting with the most concrete pattern match.
-  for (std::string key =
-       std::string(ContentSettingsPattern::kDomainWildcard) + host; ; ) {
-    HostContentSettings::const_iterator i(off_the_record_settings_.find(key));
-    if (i != off_the_record_settings_.end() &&
-        i->second.content_settings_for_resources.find(requested_setting) !=
-        i->second.content_settings_for_resources.end()) {
-      return i->second.content_settings_for_resources.find(
-          requested_setting)->second;
-    }
-
-    i = host_content_settings_.find(key);
-    if (i != host_content_settings_.end() &&
-        i->second.content_settings_for_resources.find(requested_setting) !=
-        i->second.content_settings_for_resources.end()) {
-      return i->second.content_settings_for_resources.find(
-          requested_setting)->second;
-    }
-
-    const size_t next_dot =
-        key.find('.', ContentSettingsPattern::kDomainWildcardLength);
-    if (next_dot == std::string::npos)
+  // Iterate through the list of providers and break when the first non default
+  // setting is found.
+  ContentSetting provided_setting(CONTENT_SETTING_DEFAULT);
+  for (ConstProviderIterator provider = content_settings_providers_.begin();
+       provider != content_settings_providers_.end();
+       ++provider) {
+    provided_setting = (*provider)->GetContentSetting(
+        url, url, content_type, resource_identifier);
+    if (provided_setting != CONTENT_SETTING_DEFAULT)
       break;
-    key.erase(ContentSettingsPattern::kDomainWildcardLength,
-              next_dot - ContentSettingsPattern::kDomainWildcardLength + 1);
   }
-
-  return CONTENT_SETTING_DEFAULT;
+  return provided_setting;
 }
 
 ContentSettings HostContentSettingsMap::GetContentSettings(
@@ -293,16 +179,12 @@ ContentSettings HostContentSettingsMap::GetContentSettings(
   // If we require a resource identifier, set the content settings to default,
   // otherwise make the defaults explicit.
   for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j) {
-    if (RequiresResourceIdentifier(ContentSettingsType(j))) {
-      output.settings[j] = CONTENT_SETTING_DEFAULT;
-    } else {
-      // A managed default content setting has the highest priority and hence
-      // will overwrite any previously set value.
-      if ((output.settings[j] == CONTENT_SETTING_DEFAULT &&
-           j != CONTENT_SETTINGS_TYPE_PLUGINS) ||
-          IsDefaultContentSettingManaged(ContentSettingsType(j))) {
-        output.settings[j] = GetDefaultContentSetting(ContentSettingsType(j));
-      }
+    // A managed default content setting has the highest priority and hence
+    // will overwrite any previously set value.
+    if ((output.settings[j] == CONTENT_SETTING_DEFAULT &&
+         j != CONTENT_SETTINGS_TYPE_PLUGINS) ||
+         IsDefaultContentSettingManaged(ContentSettingsType(j))) {
+      output.settings[j] = GetDefaultContentSetting(ContentSettingsType(j));
     }
   }
   return output;
@@ -313,53 +195,11 @@ ContentSettings HostContentSettingsMap::GetNonDefaultContentSettings(
   if (ShouldAllowAllContent(url))
       return ContentSettings(CONTENT_SETTING_ALLOW);
 
-  base::AutoLock auto_lock(lock_);
-
-  const std::string host(net::GetHostOrSpecFromURL(url));
-  ContentSettings output;
-  for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j)
-    output.settings[j] = CONTENT_SETTING_DEFAULT;
-
-  // Check for exact matches first.
-  HostContentSettings::const_iterator i(host_content_settings_.find(host));
-  if (i != host_content_settings_.end())
-    output = i->second.content_settings;
-
-  // If this map is not for an off-the-record profile, these searches will never
-  // match. The additional off-the-record exceptions always overwrite the
-  // regular ones.
-  i = off_the_record_settings_.find(host);
-  if (i != off_the_record_settings_.end()) {
-    for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j)
-      if (i->second.content_settings.settings[j] != CONTENT_SETTING_DEFAULT)
-        output.settings[j] = i->second.content_settings.settings[j];
-  }
-
-  // Match patterns starting with the most concrete pattern match.
-  for (std::string key =
-       std::string(ContentSettingsPattern::kDomainWildcard) + host; ; ) {
-    HostContentSettings::const_iterator i(off_the_record_settings_.find(key));
-    if (i != off_the_record_settings_.end()) {
-      for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j) {
-        if (output.settings[j] == CONTENT_SETTING_DEFAULT)
-          output.settings[j] = i->second.content_settings.settings[j];
-      }
-    }
-    i = host_content_settings_.find(key);
-    if (i != host_content_settings_.end()) {
-      for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j) {
-        if (output.settings[j] == CONTENT_SETTING_DEFAULT)
-          output.settings[j] = i->second.content_settings.settings[j];
-      }
-    }
-    const size_t next_dot =
-        key.find('.', ContentSettingsPattern::kDomainWildcardLength);
-    if (next_dot == std::string::npos)
-      break;
-    key.erase(ContentSettingsPattern::kDomainWildcardLength,
-              next_dot - ContentSettingsPattern::kDomainWildcardLength + 1);
+  ContentSettings output(CONTENT_SETTING_DEFAULT);
+  for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j) {
+    output.settings[j] = GetNonDefaultContentSetting(
+        url, ContentSettingsType(j) , "");
   }
-
   return output;
 }
 
@@ -367,43 +207,36 @@ void HostContentSettingsMap::GetSettingsForOneType(
     ContentSettingsType content_type,
     const std::string& resource_identifier,
     SettingsForOneType* settings) const {
-  DCHECK(RequiresResourceIdentifier(content_type) !=
-         resource_identifier.empty());
   DCHECK(settings);
   settings->clear();
 
-  const HostContentSettings* map_to_return =
-      is_off_the_record_ ? &off_the_record_settings_ : &host_content_settings_;
-  ContentSettingsTypeResourceIdentifierPair
-      requested_setting(content_type, resource_identifier);
-
-  base::AutoLock auto_lock(lock_);
-  for (HostContentSettings::const_iterator i(map_to_return->begin());
-       i != map_to_return->end(); ++i) {
-    ContentSetting setting;
-    if (RequiresResourceIdentifier(content_type)) {
-      if (i->second.content_settings_for_resources.find(requested_setting) !=
-          i->second.content_settings_for_resources.end())
-        setting = i->second.content_settings_for_resources.find(
-            requested_setting)->second;
-      else
-        setting = CONTENT_SETTING_DEFAULT;
-    } else {
-     setting = i->second.content_settings.settings[content_type];
-    }
-    if (setting != CONTENT_SETTING_DEFAULT) {
-      // Use of push_back() relies on the map iterator traversing in order of
-      // ascending keys.
-      settings->push_back(
-          std::make_pair(ContentSettingsPattern(i->first), setting));
-    }
+  // Collect content_settings::Rules for the given content_type and
+  // resource_identifier from the content settings providers.
+  Rules content_settings_rules;
+  for (ConstProviderIterator provider = content_settings_providers_.begin();
+       provider != content_settings_providers_.end();
+       ++provider) {
+    // TODO(markusheintz): Only the rules that are applied should be collected.
+    // Merge rules.
+    (*provider)->GetAllContentSettingsRules(
+      content_type, resource_identifier, &content_settings_rules);
+  }
+
+  // convert Rules to SettingsForOneType
+  for (const_rules_iterator rule_iterator =
+           content_settings_rules.begin();
+       rule_iterator != content_settings_rules.end();
+       ++rule_iterator) {
+    settings->push_back(std::make_pair(ContentSettingsPattern(
+        rule_iterator->requesting_url_pattern),
+        rule_iterator->content_setting));
   }
 }
 
 void HostContentSettingsMap::SetDefaultContentSetting(
     ContentSettingsType content_type,
     ContentSetting setting) {
-  for (provider_iterator provider =
+  for (DefaultProviderIterator provider =
            default_content_settings_providers_.begin();
        provider != default_content_settings_providers_.end(); ++provider) {
     (*provider)->UpdateDefaultSetting(content_type, setting);
@@ -411,109 +244,16 @@ void HostContentSettingsMap::SetDefaultContentSetting(
 }
 
 void HostContentSettingsMap::SetContentSetting(
-    const ContentSettingsPattern& original_pattern,
+    const ContentSettingsPattern& pattern,
     ContentSettingsType content_type,
     const std::string& resource_identifier,
     ContentSetting setting) {
-  DCHECK(kTypeNames[content_type] != NULL);  // Don't call this for Geolocation.
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  DCHECK_NE(RequiresResourceIdentifier(content_type),
-            resource_identifier.empty());
-  DCHECK(content_type != CONTENT_SETTINGS_TYPE_PLUGINS ||
-         setting != CONTENT_SETTING_ASK ||
-         CommandLine::ForCurrentProcess()->HasSwitch(
-            switches::kEnableClickToPlay));
-
-  const ContentSettingsPattern pattern(original_pattern.CanonicalizePattern());
-
-  bool early_exit = false;
-  std::string pattern_str(pattern.AsString());
-  PrefService* prefs = NULL;
-  DictionaryValue* all_settings_dictionary = NULL;
-  HostContentSettings* map_to_modify = &off_the_record_settings_;
-  if (!is_off_the_record_) {
-    prefs = profile_->GetPrefs();
-    all_settings_dictionary =
-      prefs->GetMutableDictionary(prefs::kContentSettingsPatterns);
-    map_to_modify = &host_content_settings_;
-  }
-
-  {
-    base::AutoLock auto_lock(lock_);
-    if (!map_to_modify->count(pattern_str))
-      (*map_to_modify)[pattern_str].content_settings = ContentSettings();
-    HostContentSettings::iterator
-        i(map_to_modify->find(pattern_str));
-    ContentSettings& settings = i->second.content_settings;
-    if (RequiresResourceIdentifier(content_type)) {
-      settings.settings[content_type] = CONTENT_SETTING_DEFAULT;
-      if (setting != CONTENT_SETTING_DEFAULT) {
-        i->second.content_settings_for_resources[
-            ContentSettingsTypeResourceIdentifierPair(content_type,
-            resource_identifier)] = setting;
-      } else {
-        i->second.content_settings_for_resources.erase(
-            ContentSettingsTypeResourceIdentifierPair(content_type,
-            resource_identifier));
-      }
-    } else {
-      settings.settings[content_type] = setting;
-    }
-    if (AllDefault(i->second)) {
-      map_to_modify->erase(i);
-      if (all_settings_dictionary)
-        all_settings_dictionary->RemoveWithoutPathExpansion(pattern_str, NULL);
-
-      // We can't just return because |NotifyObservers()| needs to be called,
-      // without |lock_| being held.
-      early_exit = true;
-    }
-  }
-
-  if (!early_exit && all_settings_dictionary) {
-    DictionaryValue* host_settings_dictionary = NULL;
-    bool found = all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-        pattern_str, &host_settings_dictionary);
-    if (!found) {
-      host_settings_dictionary = new DictionaryValue;
-      all_settings_dictionary->SetWithoutPathExpansion(
-          pattern_str, host_settings_dictionary);
-      DCHECK_NE(setting, CONTENT_SETTING_DEFAULT);
-    }
-    if (RequiresResourceIdentifier(content_type)) {
-      std::string dictionary_path(kResourceTypeNames[content_type]);
-      DictionaryValue* resource_dictionary = NULL;
-      found = host_settings_dictionary->GetDictionary(
-          dictionary_path, &resource_dictionary);
-      if (!found) {
-        resource_dictionary = new DictionaryValue;
-        host_settings_dictionary->Set(dictionary_path, resource_dictionary);
-      }
-      if (setting == CONTENT_SETTING_DEFAULT) {
-        resource_dictionary->RemoveWithoutPathExpansion(resource_identifier,
-                                                        NULL);
-      } else {
-        resource_dictionary->SetWithoutPathExpansion(
-            resource_identifier, Value::CreateIntegerValue(setting));
-      }
-    } else {
-      std::string dictionary_path(kTypeNames[content_type]);
-      if (setting == CONTENT_SETTING_DEFAULT) {
-        host_settings_dictionary->RemoveWithoutPathExpansion(dictionary_path,
-                                                             NULL);
-      } else {
-        host_settings_dictionary->SetWithoutPathExpansion(
-            dictionary_path, Value::CreateIntegerValue(setting));
-      }
-    }
+  for (ProviderIterator provider = content_settings_providers_.begin();
+       provider != content_settings_providers_.end();
+       ++provider) {
+    (*provider)->SetContentSetting(
+        pattern, pattern, content_type, resource_identifier, setting);
   }
-
-  updating_preferences_ = true;
-  if (!is_off_the_record_)
-    ScopedPrefUpdate update(prefs, prefs::kContentSettingsPatterns);
-  updating_preferences_ = false;
-
-  NotifyObservers(ContentSettingsDetails(pattern, content_type, ""));
 }
 
 void HostContentSettingsMap::AddExceptionForURL(
@@ -535,68 +275,10 @@ void HostContentSettingsMap::AddExceptionForURL(
 
 void HostContentSettingsMap::ClearSettingsForOneType(
     ContentSettingsType content_type) {
-  DCHECK(kTypeNames[content_type] != NULL);  // Don't call this for Geolocation.
-
-  PrefService* prefs = NULL;
-  DictionaryValue* all_settings_dictionary = NULL;
-  HostContentSettings* map_to_modify = &off_the_record_settings_;
-
-  if (!is_off_the_record_) {
-    prefs = profile_->GetPrefs();
-    all_settings_dictionary =
-      prefs->GetMutableDictionary(prefs::kContentSettingsPatterns);
-    map_to_modify = &host_content_settings_;
-  }
-
-  {
-    base::AutoLock auto_lock(lock_);
-    for (HostContentSettings::iterator i(map_to_modify->begin());
-         i != map_to_modify->end(); ) {
-      if (RequiresResourceIdentifier(content_type) ||
-          i->second.content_settings.settings[content_type] !=
-          CONTENT_SETTING_DEFAULT) {
-        if (RequiresResourceIdentifier(content_type))
-          i->second.content_settings_for_resources.clear();
-        i->second.content_settings.settings[content_type] =
-            CONTENT_SETTING_DEFAULT;
-        std::string host(i->first);
-        if (AllDefault(i->second)) {
-          if (all_settings_dictionary)
-            all_settings_dictionary->
-                RemoveWithoutPathExpansion(host, NULL);
-          map_to_modify->erase(i++);
-        } else if (all_settings_dictionary) {
-          DictionaryValue* host_settings_dictionary;
-          bool found =
-              all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-                  host, &host_settings_dictionary);
-          DCHECK(found);
-          host_settings_dictionary->RemoveWithoutPathExpansion(
-              kTypeNames[content_type], NULL);
-          ++i;
-        }
-      } else {
-        ++i;
-      }
-    }
-  }
-
-  updating_preferences_ = true;
-  if (!is_off_the_record_)
-    ScopedPrefUpdate update(prefs, prefs::kContentSettingsPatterns);
-  updating_preferences_ = false;
-
-  NotifyObservers(
-      ContentSettingsDetails(ContentSettingsPattern(), content_type, ""));
-}
-
-bool HostContentSettingsMap::RequiresResourceIdentifier(
-    ContentSettingsType content_type) const {
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableResourceContentSettings)) {
-    return kRequiresResourceIdentifier[content_type];
-  } else {
-    return false;
+  for (ProviderIterator provider = content_settings_providers_.begin();
+       provider != content_settings_providers_.end();
+       ++provider) {
+    (*provider)->ClearAllContentSettingsRules(content_type);
   }
 }
 
@@ -644,7 +326,6 @@ void HostContentSettingsMap::SetBlockNonsandboxedPlugins(bool block) {
     block_nonsandboxed_plugins_ = block;
   }
 
-
   PrefService* prefs = profile_->GetPrefs();
   if (block) {
     UserMetrics::RecordAction(
@@ -662,13 +343,18 @@ void HostContentSettingsMap::ResetToDefaults() {
 
   {
     base::AutoLock auto_lock(lock_);
-    for (provider_iterator provider =
+    for (DefaultProviderIterator provider =
              default_content_settings_providers_.begin();
          provider != default_content_settings_providers_.end(); ++provider) {
       (*provider)->ResetToDefaults();
     }
-    host_content_settings_.clear();
-    off_the_record_settings_.clear();
+
+    for (ProviderIterator provider = content_settings_providers_.begin();
+         provider != content_settings_providers_.end();
+         ++provider) {
+      (*provider)->ResetToDefaults();
+    }
+
     // Don't reset block third party cookies if they are managed.
     if (!IsBlockThirdPartyCookiesManaged())
       block_third_party_cookies_ = false;
@@ -678,7 +364,6 @@ void HostContentSettingsMap::ResetToDefaults() {
   if (!is_off_the_record_) {
     PrefService* prefs = profile_->GetPrefs();
     updating_preferences_ = true;
-    prefs->ClearPref(prefs::kContentSettingsPatterns);
     // If the block third party cookies preference is managed we still must
     // clear it in order to restore the default value for later when the
     // preference is not managed anymore.
@@ -702,9 +387,7 @@ void HostContentSettingsMap::Observe(NotificationType type,
       return;
 
     std::string* name = Details<std::string>(details).ptr();
-    if (*name == prefs::kContentSettingsPatterns) {
-      ReadExceptions(true);
-    } else if (*name == prefs::kBlockThirdPartyCookies) {
+    if (*name == prefs::kBlockThirdPartyCookies) {
       base::AutoLock auto_lock(lock_);
       block_third_party_cookies_ = profile_->GetPrefs()->GetBoolean(
           prefs::kBlockThirdPartyCookies);
@@ -737,77 +420,9 @@ HostContentSettingsMap::~HostContentSettingsMap() {
   UnregisterObservers();
 }
 
-void HostContentSettingsMap::GetSettingsFromDictionary(
-    const DictionaryValue* dictionary,
-    ContentSettings* settings) {
-  for (DictionaryValue::key_iterator i(dictionary->begin_keys());
-       i != dictionary->end_keys(); ++i) {
-    const std::string& content_type(*i);
-    for (size_t type = 0; type < arraysize(kTypeNames); ++type) {
-      if ((kTypeNames[type] != NULL) && (kTypeNames[type] == content_type)) {
-        int setting = CONTENT_SETTING_DEFAULT;
-        bool found = dictionary->GetIntegerWithoutPathExpansion(content_type,
-                                                                &setting);
-        DCHECK(found);
-        settings->settings[type] = IntToContentSetting(setting);
-        break;
-      }
-    }
-  }
-  // Migrate obsolete cookie prompt mode.
-  if (settings->settings[CONTENT_SETTINGS_TYPE_COOKIES] ==
-      CONTENT_SETTING_ASK)
-    settings->settings[CONTENT_SETTINGS_TYPE_COOKIES] = CONTENT_SETTING_BLOCK;
-
-  settings->settings[CONTENT_SETTINGS_TYPE_PLUGINS] =
-      ClickToPlayFixup(CONTENT_SETTINGS_TYPE_PLUGINS,
-                       settings->settings[CONTENT_SETTINGS_TYPE_PLUGINS]);
-}
-
-void HostContentSettingsMap::GetResourceSettingsFromDictionary(
-    const DictionaryValue* dictionary,
-    ResourceContentSettings* settings) {
-  for (DictionaryValue::key_iterator i(dictionary->begin_keys());
-       i != dictionary->end_keys(); ++i) {
-    const std::string& content_type(*i);
-    for (size_t type = 0; type < arraysize(kResourceTypeNames); ++type) {
-      if ((kResourceTypeNames[type] != NULL) &&
-          (kResourceTypeNames[type] == content_type)) {
-        DictionaryValue* resource_dictionary = NULL;
-        bool found = dictionary->GetDictionary(content_type,
-                                               &resource_dictionary);
-        DCHECK(found);
-        for (DictionaryValue::key_iterator j(resource_dictionary->begin_keys());
-             j != resource_dictionary->end_keys(); ++j) {
-          const std::string& resource_identifier(*j);
-          int setting = CONTENT_SETTING_DEFAULT;
-          bool found = resource_dictionary->GetIntegerWithoutPathExpansion(
-              resource_identifier, &setting);
-          DCHECK(found);
-          (*settings)[ContentSettingsTypeResourceIdentifierPair(
-              ContentSettingsType(type), resource_identifier)] =
-                  ClickToPlayFixup(ContentSettingsType(type),
-                                   ContentSetting(setting));
-        }
-
-        break;
-      }
-    }
-  }
-}
-
-bool HostContentSettingsMap::AllDefault(
-    const ExtendedContentSettings& settings) const {
-  for (size_t i = 0; i < arraysize(settings.content_settings.settings); ++i) {
-    if (settings.content_settings.settings[i] != CONTENT_SETTING_DEFAULT)
-      return false;
-  }
-  return settings.content_settings_for_resources.empty();
-}
-
 bool HostContentSettingsMap::IsDefaultContentSettingManaged(
     ContentSettingsType content_type) const {
-  for (const_provider_iterator provider =
+  for (ConstDefaultProviderIterator provider =
            default_content_settings_providers_.begin();
        provider != default_content_settings_providers_.end(); ++provider) {
     if ((*provider)->DefaultSettingIsManaged(content_type))
@@ -816,40 +431,6 @@ bool HostContentSettingsMap::IsDefaultContentSettingManaged(
   return false;
 }
 
-void HostContentSettingsMap::ReadExceptions(bool overwrite) {
-  base::AutoLock lock(lock_);
-
-  PrefService* prefs = profile_->GetPrefs();
-  DictionaryValue* all_settings_dictionary =
-      prefs->GetMutableDictionary(prefs::kContentSettingsPatterns);
-
-  if (overwrite)
-    host_content_settings_.clear();
-
-  // Careful: The returned value could be NULL if the pref has never been set.
-  if (all_settings_dictionary != NULL) {
-    // Convert all Unicode patterns into punycode form, then read.
-    CanonicalizeContentSettingsExceptions(all_settings_dictionary);
-
-    for (DictionaryValue::key_iterator i(all_settings_dictionary->begin_keys());
-         i != all_settings_dictionary->end_keys(); ++i) {
-      const std::string& pattern(*i);
-      if (!ContentSettingsPattern(pattern).IsValid())
-        LOG(WARNING) << "Invalid pattern stored in content settings";
-      DictionaryValue* pattern_settings_dictionary = NULL;
-      bool found = all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-          pattern, &pattern_settings_dictionary);
-      DCHECK(found);
-      ContentSettings settings;
-      GetSettingsFromDictionary(pattern_settings_dictionary, &settings);
-      host_content_settings_[pattern].content_settings = settings;
-      GetResourceSettingsFromDictionary(
-          pattern_settings_dictionary,
-          &host_content_settings_[pattern].content_settings_for_resources);
-    }
-  }
-}
-
 void HostContentSettingsMap::NotifyObservers(
     const ContentSettingsDetails& details) {
   NotificationService::current()->Notify(
@@ -883,90 +464,3 @@ void HostContentSettingsMap::MigrateObsoleteCookiePref(PrefService* prefs) {
     }
   }
 }
-
-void HostContentSettingsMap::MigrateObsoletePopupsPref(PrefService* prefs) {
-  if (prefs->HasPrefPath(prefs::kPopupWhitelistedHosts)) {
-    const ListValue* whitelist_pref =
-        prefs->GetList(prefs::kPopupWhitelistedHosts);
-    for (ListValue::const_iterator i(whitelist_pref->begin());
-         i != whitelist_pref->end(); ++i) {
-      std::string host;
-      (*i)->GetAsString(&host);
-      SetContentSetting(ContentSettingsPattern(host),
-                        CONTENT_SETTINGS_TYPE_POPUPS,
-                        "",
-                        CONTENT_SETTING_ALLOW);
-    }
-    prefs->ClearPref(prefs::kPopupWhitelistedHosts);
-  }
-}
-
-void HostContentSettingsMap::MigrateObsoletePerhostPref(PrefService* prefs) {
-  if (prefs->HasPrefPath(prefs::kPerHostContentSettings)) {
-    const DictionaryValue* all_settings_dictionary =
-        prefs->GetDictionary(prefs::kPerHostContentSettings);
-    for (DictionaryValue::key_iterator i(all_settings_dictionary->begin_keys());
-         i != all_settings_dictionary->end_keys(); ++i) {
-      const std::string& host(*i);
-      ContentSettingsPattern pattern(
-          std::string(ContentSettingsPattern::kDomainWildcard) + host);
-      DictionaryValue* host_settings_dictionary = NULL;
-      bool found = all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-          host, &host_settings_dictionary);
-      DCHECK(found);
-      ContentSettings settings;
-      GetSettingsFromDictionary(host_settings_dictionary, &settings);
-      for (int j = 0; j < CONTENT_SETTINGS_NUM_TYPES; ++j) {
-        if (settings.settings[j] != CONTENT_SETTING_DEFAULT &&
-            !RequiresResourceIdentifier(ContentSettingsType(j)))
-          SetContentSetting(
-              pattern, ContentSettingsType(j), "", settings.settings[j]);
-      }
-    }
-    prefs->ClearPref(prefs::kPerHostContentSettings);
-  }
-}
-
-void HostContentSettingsMap::CanonicalizeContentSettingsExceptions(
-    DictionaryValue* all_settings_dictionary) {
-  DCHECK(all_settings_dictionary);
-
-  std::vector<std::string> remove_items;
-  std::vector<std::pair<std::string, std::string> > move_items;
-  for (DictionaryValue::key_iterator i(all_settings_dictionary->begin_keys());
-       i != all_settings_dictionary->end_keys(); ++i) {
-    const std::string& pattern(*i);
-    const std::string canonicalized_pattern =
-        ContentSettingsPattern(pattern).CanonicalizePattern();
-
-    if (canonicalized_pattern.empty() || canonicalized_pattern == pattern)
-      continue;
-
-    // Clear old pattern if prefs already have canonicalized pattern.
-    DictionaryValue* new_pattern_settings_dictionary = NULL;
-    if (all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-            canonicalized_pattern, &new_pattern_settings_dictionary)) {
-      remove_items.push_back(pattern);
-      continue;
-    }
-
-    // Move old pattern to canonicalized pattern.
-    DictionaryValue* old_pattern_settings_dictionary = NULL;
-    if (all_settings_dictionary->GetDictionaryWithoutPathExpansion(
-            pattern, &old_pattern_settings_dictionary)) {
-      move_items.push_back(std::make_pair(pattern, canonicalized_pattern));
-    }
-  }
-
-  for (size_t i = 0; i < remove_items.size(); ++i) {
-    all_settings_dictionary->RemoveWithoutPathExpansion(remove_items[i], NULL);
-  }
-
-  for (size_t i = 0; i < move_items.size(); ++i) {
-    Value* pattern_settings_dictionary = NULL;
-    all_settings_dictionary->RemoveWithoutPathExpansion(
-        move_items[i].first, &pattern_settings_dictionary);
-    all_settings_dictionary->SetWithoutPathExpansion(
-        move_items[i].second, pattern_settings_dictionary);
-  }
-}