Delegating the "are images allowed" decision to renderer.

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 36 matching lines @@
   virtual void ShutdownOnUIThread() = 0;
 };
 
 class ProviderInterface {
  public:
   struct Rule {
     Rule();
     Rule(const ContentSettingsPattern& primary_pattern,
          const ContentSettingsPattern& secondary_pattern,
          ContentSetting setting);
+    bool operator<(const Rule& rhs) const;
 
     ContentSettingsPattern primary_pattern;
     ContentSettingsPattern secondary_pattern;
     ContentSetting content_setting;
   };
 
   typedef std::vector<Rule> Rules;
 
   virtual ~ProviderInterface() {}
 
@@ skipping 65 matching lines @@
   // Detaches the Provider from all Profile-related objects like PrefService.
   // This methods needs to be called before destroying the Profile.
   // Afterwards, none of the methods above that should only be called on the UI
   // thread should be called anymore.
   virtual void ShutdownOnUIThread() = 0;
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_