Remove support for the keygen tag

components/content_settings/core/browser/host_content_settings_map.h

 // Copyright (c) 2012 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.
 
 // Maps hostnames to custom content settings.  Written on the UI thread and read
 // on any thread.  One instance per profile.
 
 #ifndef COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_
 
@@ skipping 296 matching lines @@
 
   base::WeakPtr<HostContentSettingsMap> GetWeakPtr();
 
  private:
   friend class base::RefCountedThreadSafe<HostContentSettingsMap>;
 
   FRIEND_TEST_ALL_PREFIXES(HostContentSettingsMapTest,
                            DomainToOriginMigrationStatus);
   FRIEND_TEST_ALL_PREFIXES(HostContentSettingsMapTest,
                            MigrateDomainScopedSettings);
-  FRIEND_TEST_ALL_PREFIXES(HostContentSettingsMapTest, MigrateKeygenSettings);
 
   friend class content_settings::TestUtils;
 
   ~HostContentSettingsMap() override;
 
   ContentSetting GetDefaultContentSettingFromProvider(
       ContentSettingsType content_type,
       content_settings::ProviderInterface* provider) const;
 
   // Retrieves default content setting for |content_type|, and writes the
   // provider's type to |provider_type| (must not be null).
   ContentSetting GetDefaultContentSettingInternal(
       ContentSettingsType content_type,
       ProviderType* provider_type) const;
 
-  // Migrate Keygen settings which only use a primary pattern. Settings which
-  // only used a primary pattern were inconsistent in what they did with the
-  // secondary pattern. Some stored a ContentSettingsPattern::Wildcard() whereas
-  // others stored the same pattern twice. This function migrates all such
-  // settings to use ContentSettingsPattern::Wildcard(). This allows us to make
-  // the scoping code consistent across different settings.
-  // TODO(lshang): Remove this when clients have migrated (~M53). We should
-  // leave in some code to remove old-format settings for a long time.
-  void MigrateKeygenSettings();
-
   // Collect UMA data of exceptions.
   void RecordExceptionMetrics();
 
   // Adds content settings for |content_type| and |resource_identifier|,
   // provided by |provider|, into |settings|. If |incognito| is true, adds only
   // the content settings which are applicable to the incognito mode and differ
   // from the normal mode. Otherwise, adds the content settings for the normal
   // mode.
   void AddSettingsForOneType(
       const content_settings::ProviderInterface* provider,
@@ skipping 68 matching lines @@
   base::ThreadChecker thread_checker_;
 
   base::ObserverList<content_settings::Observer> observers_;
 
   base::WeakPtrFactory<HostContentSettingsMap> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostContentSettingsMap);
 };
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_HOST_CONTENT_SETTINGS_MAP_H_