Disable Web Notifications in Incognito

components/content_settings/core/browser/content_settings_info.h

 // Copyright 2015 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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/content_settings/core/common/content_settings.h"
 
 namespace content_settings {
 
 class WebsiteSettingsInfo;
 
 class ContentSettingsInfo {
  public:
   enum IncognitoBehavior {
     // Content setting will be inherited from regular to incognito profiles
     // as usual.
     INHERIT_IN_INCOGNITO,
 
     // Content setting will only partially inherit from regular to incognito
     // profiles: BLOCK will inherit as usual, but ALLOW will become ASK.
     // This is unusual, so seek privacy review before using this.
-    INHERIT_IN_INCOGNITO_EXCEPT_ALLOW
+    INHERIT_IN_INCOGNITO_EXCEPT_ALLOW,
+
+    // Content setting is always denied in incognito. However, to prevent sites
+    // from using this setting to detect whether incognito mode is active, this
+    // acts like INHERIT_IN_INCOGNITO_EXCEPT_ALLOW initially, and only denies
+    // the permission once it is requested, after a random time delay that
+    // simulates a user clicking a bubble/infobar.
+    // This is unusual, so seek privacy review before using this.

[raymes, 2016/01/11 00:41:11]

nit: fill previous line (or new paragraph)

[johnme, 2016/01/11 13:53:52]

Done.

+    DENY_IN_INCOGNITO_AFTER_DELAY
   };
 
   // This object does not take ownership of |website_settings_info|.
   ContentSettingsInfo(const WebsiteSettingsInfo* website_settings_info,
                       const std::vector<std::string>& whitelisted_schemes,
                       const std::set<ContentSetting>& valid_settings,
                       IncognitoBehavior incognito_behavior);
   ~ContentSettingsInfo();
 
   const WebsiteSettingsInfo* website_settings_info() const {
@@ skipping 12 matching lines @@
   const std::vector<std::string> whitelisted_schemes_;
   const std::set<ContentSetting> valid_settings_;
   const IncognitoBehavior incognito_behavior_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsInfo);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_INFO_H_