Detach the dependency from host_content_settings_map to extension.

chrome/browser/content_settings/content_settings_default_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 34 matching lines @@
       const ContentSettingsPattern& secondary_pattern,
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       base::Value* value) OVERRIDE;
 
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type) OVERRIDE;
 
   virtual void ShutdownOnUIThread() OVERRIDE;
 
+  virtual std::string GetProviderName() const OVERRIDE;
+
+  virtual SettingSource GetSettingSource() const OVERRIDE;
+
  private:
   // Sets the fields of |settings| based on the values in |dictionary|.
   void GetSettingsFromDictionary(const base::DictionaryValue* dictionary);
 
   // Forces the default settings to be explicitly set instead of themselves
   // being CONTENT_SETTING_DEFAULT.
   void ForceDefaultsToBeExplicit();
 
   // Reads the default settings from the preferences service. If |overwrite| is
   // true and the preference is missing, the local copy will be cleared as well.
@@ skipping 21 matching lines @@
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultProvider);
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_DEFAULT_PROVIDER_H_