Remove migration of obsolete value for "session.restore_on_startup".

chrome/browser/profile_resetter/profile_resetter.cc

 // Copyright (c) 2013 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/browser/profile_resetter/profile_resetter.h"
 
 #include <string>
 
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
@@ skipping 264 matching lines @@
       master_settings_->GetUrlsToRestoreOnStartup());
   if (url_list)
     ListPrefUpdate(prefs, prefs::kURLsToRestoreOnStartup)->Swap(url_list.get());
 
   int restore_on_startup;
   if (master_settings_->GetRestoreOnStartup(&restore_on_startup))
     prefs->SetInteger(prefs::kRestoreOnStartup, restore_on_startup);
   else
     prefs->ClearPref(prefs::kRestoreOnStartup);
 
-  prefs->SetBoolean(prefs::kRestoreOnStartupMigrated, true);
   MarkAsDone(STARTUP_PAGES);
 }
 
 void ProfileResetter::ResetPinnedTabs() {
   // Unpin all the tabs.
   for (chrome::BrowserIterator it; !it.done(); it.Next()) {
     if (it->is_type_tabbed() && it->profile() == profile_) {
       TabStripModel* tab_model = it->tab_strip_model();
       // Here we assume that indexof(any mini tab) < indexof(any normal tab).
       // If we unpin the tab, it can be moved to the right. Thus traversing in
@@ skipping 57 matching lines @@
         chrome_exe,
         false,
         cancel,
         &shortcuts);
   }
   return shortcuts;
 #else
   return std::vector<ShortcutCommand>();
 #endif
 }