Remove the migration code from content_settings::PrefProvider.

components/content_settings/core/common/pref_names.cc

 // Copyright 2014 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.
 
 #include "components/content_settings/core/common/pref_names.h"
 
 namespace prefs {
 
 // Boolean that is true if we should unconditionally block third-party cookies,
 // regardless of other content settings.
 const char kBlockThirdPartyCookies[] = "profile.block_third_party_cookies";
 
 // Version of the pattern format used to define content settings.
 const char kContentSettingsVersion[] = "profile.content_settings.pref_version";
 
-// Patterns for mapping origins to origin related settings. Default settings
-// will be applied to origins that don't match any of the patterns. The pattern
-// format used is defined by kContentSettingsVersion.
-const char kContentSettingsPatternPairs[] =
-    "profile.content_settings.pattern_pairs";
-
 // Integer that specifies the index of the tab the user was on when they
 // last visited the content settings window.
 const char kContentSettingsWindowLastTabIndex[] =
     "content_settings_window.last_tab_index";
 
 // Dictionary of content settings applied to all hosts by default.
 // TODO(msramek): Deprecated. Use the individual preferences below.
 const char kDefaultContentSettings[] = "profile.default_content_settings";
 
 // Whether |kDefaultContentSettings| has already been migrated to
@@ skipping 109 matching lines @@
 const char kContentSettingsProtectedMediaIdentifierPatternPairs[] =
     "profile.content_settings.exceptions.protected_media_identifier";
 #endif
 const char kContentSettingsAppBannerPatternPairs[] =
     "profile.content_settings.exceptions.app_banner";
 const char kContentSettingsSiteEngagementPatternPairs[] =
     "profile.content_settings.exceptions.site_engagement";
 const char kContentSettingsDurableStoragePatternPairs[] =
     "profile.content_settings.exceptions.durable_storage";
 
-// Whether the patern pairs have been migrated from the deprecated aggregate
-// preference |kContentSettingsPatternPairs| to the separate preferences
-// |kContentSettings<type>PatternPairs|.
-const char kMigratedContentSettingsPatternPairs[] =
-    "profile.migrated_content_settings_exceptions";
-
 // Preferences that are exclusively used to store managed values for default
 // content settings.
 const char kManagedDefaultCookiesSetting[] =
     "profile.managed_default_content_settings.cookies";
 const char kManagedDefaultImagesSetting[] =
     "profile.managed_default_content_settings.images";
 const char kManagedDefaultJavaScriptSetting[] =
     "profile.managed_default_content_settings.javascript";
 const char kManagedDefaultPluginsSetting[] =
     "profile.managed_default_content_settings.plugins";
@@ skipping 31 matching lines @@
 const char kManagedPopupsBlockedForUrls[] =
     "profile.managed_popups_blocked_for_urls";
 const char kManagedNotificationsAllowedForUrls[] =
     "profile.managed_notifications_allowed_for_urls";
 const char kManagedNotificationsBlockedForUrls[] =
     "profile.managed_notifications_blocked_for_urls";
 const char kManagedAutoSelectCertificateForUrls[] =
     "profile.managed_auto_select_certificate_for_urls";
 
 }  // namespace prefs