Remove year+ old migration support of "session.urls_to_restore_on_startup".

chrome/common/pref_names.cc

 // 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.
 
 #include "chrome/common/pref_names.h"
 
 #include "base/basictypes.h"
 #include "chrome/common/features.h"
 #include "chrome/common/pref_font_webkit_names.h"
 
@@ skipping 63 matching lines @@
 // 4: restore the URLs defined in kURLsToRestoreOnStartup.
 // 5: open the New Tab Page on startup.
 const char kRestoreOnStartup[] = "session.restore_on_startup";
 
 // A preference to keep track of whether we have already checked whether we
 // need to migrate the user from kRestoreOnStartup=0 to kRestoreOnStartup=4.
 // We only need to do this check once, on upgrade from m18 or lower to m19 or
 // higher.
 const char kRestoreOnStartupMigrated[] = "session.restore_on_startup_migrated";
 
-// Serialized migration time of kURLsToRestoreOnStartup (see
-// base::Time::ToInternalValue for details on serialization format).
-const char kRestoreStartupURLsMigrationTime[] =
-    "session.startup_urls_migration_time";
-
 // The URLs to restore on startup or when the home button is pressed. The URLs
 // are only restored on startup if kRestoreOnStartup is 4.
 const char kURLsToRestoreOnStartup[] = "session.startup_urls";
 
-// Old startup url pref name for kURLsToRestoreOnStartup.
-const char kURLsToRestoreOnStartupOld[] = "session.urls_to_restore_on_startup";
-
 // Stores the email address associated with the google account of the custodian
 // of the supervised user, set when the supervised user is created.
 const char kSupervisedUserCustodianEmail[] = "profile.managed.custodian_email";
 
 // Stores the display name associated with the google account of the custodian
 // of the supervised user, updated (if possible) each time the supervised user
 // starts a session.
 const char kSupervisedUserCustodianName[] = "profile.managed.custodian_name";
 
 // Stores the URL of the profile image associated with the google account of the
@@ skipping 2064 matching lines @@
 // Policy that indicates how to handle animated images.
 const char kAnimationPolicy[] = "settings.a11y.animation_policy";
 #endif
 
 const char kBackgroundTracingLastUpload[] = "background_tracing.last_upload";
 
 const char kAllowDinosaurEasterEgg[] =
     "allow_dinosaur_easter_egg";
 
 }  // namespace prefs