Add content_settings::PrefProvider to HostContentSettingsMap.

chrome/browser/content_settings/content_settings_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.
 
 // Interface for objects providing content setting rules.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #pragma once
 
@@ skipping 38 matching lines @@
 
   struct Rule {
     Rule() {}
     Rule(const ContentSettingsPattern& requesting_pattern,
          const ContentSettingsPattern& embedding_pattern,
          ContentSetting setting)
       : requesting_url_pattern(requesting_pattern),
         embedding_url_pattern(embedding_pattern),
         content_setting(setting) {}
 
-    const ContentSettingsPattern requesting_url_pattern;
-    const ContentSettingsPattern embedding_url_pattern;
+    ContentSettingsPattern requesting_url_pattern;
+    ContentSettingsPattern embedding_url_pattern;
     ContentSetting content_setting;
   };
 
   typedef std::vector<Rule> Rules;
 
   virtual ~ProviderInterface() {}
 
   // Returns a single ContentSetting which applies to a given |requesting_url|,
   // |embedding_url| pair or CONTENT_SETTING_DEFAULT, if no rule applies. For
   // ContentSettingsTypes that require a resource identifier to be specified,
@@ skipping 26 matching lines @@
   // from the corresponding regular provider. For ContentSettingsTypes that
   // require a resource identifier to be specified, the |resource_identifier|
   // must be non-empty.
   //
   // This may be called on any thread.
   virtual void GetAllContentSettingsRules(
       ContentSettingsType content_type,
       const ResourceIdentifier& resource_identifier,
       Rules* content_setting_rules) const = 0;
 
-  // Resets all content settings to CONTENT_SETTING_DEFAULT.
+  // Resets all content settings for the given |content_type| to
+  // CONTENT_SETTING_DEFAULT. For content types that require a resource
+  // identifier all content settings for any resource identifieres of the given
+  // |content_type| will be reset to CONTENT_SETTING_DEFAULT.
   //
   // This should only be called on the UI thread.
-  virtual void ClearAllContentSettingsRules() = 0;
+  virtual void ClearAllContentSettingsRules(
+      ContentSettingsType content_type) = 0;
+
+  // Resets all content settings to CONTENT_SETTINGS_DEFAULT.
+  //
+  // This should only be called on the UI thread.
+  virtual void ResetToDefaults() = 0;
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_