Delegating the "are images allowed" decision to renderer.

chrome/browser/content_settings/host_content_settings_map.h

Index: chrome/browser/content_settings/host_content_settings_map.h
diff --git a/chrome/browser/content_settings/host_content_settings_map.h b/chrome/browser/content_settings/host_content_settings_map.h
index 3a9724b6e47f6af6bf2acb7875b0d80834bc11e8..ee6b45f9bacd40f0aca2b68a215bda9b499039ff 100644
--- a/chrome/browser/content_settings/host_content_settings_map.h
+++ b/chrome/browser/content_settings/host_content_settings_map.h
@@ -124,6 +124,13 @@ class HostContentSettingsMap
                              const std::string& resource_identifier,
                              SettingsForOneType* settings) const;
 
+  // For a given content type, returns all patterns with a non-default setting,
+  // mapped to their actual setting, in the order in which they would be checked
+  // by GetContentSetting.
+  void GetConcatenatedSettingsForOneType(ContentSettingsType content_type,
+                                         const std::string& resource_identifier,
+                                         ContentSettingRules* rules) const;
+
   // Sets the default setting for a particular content type. This method must
   // not be invoked on an incognito map.
   //