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

chrome/browser/ui/startup/startup_browser_creator_impl.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/browser/ui/startup/startup_browser_creator_impl.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "apps/app_restore_service.h"
@@ skipping 663 matching lines @@
   } else if (pref.type == SessionStartupPref::URLS && !pref.urls.empty() &&
              !HasPendingUncleanExit(profile_)) {
     std::vector<GURL> extra_urls;
     AddSpecialURLs(&extra_urls);
     UrlsToTabs(extra_urls, &tabs);
 
     // Only use the set of urls specified in preferences if nothing was
     // specified on the command line. Filter out any urls that are to be
     // restored by virtue of having been previously pinned.
     AddUniqueURLs(pref.urls, &tabs);
-  } else if (pref.type == SessionStartupPref::HOMEPAGE) {
-    // If 'homepage' selected, either by the user or by a policy, we should
-    // have migrated them to another value.
-    NOTREACHED() << "SessionStartupPref has deprecated type HOMEPAGE";
   }
 
   if (tabs.empty())
     return NULL;
 
   Browser* browser = OpenTabsInBrowser(NULL, true, tabs, desktop_type);
   return browser;
 }
 
 void StartupBrowserCreatorImpl::AddUniqueURLs(const std::vector<GURL>& urls,
@@ skipping 298 matching lines @@
 #if defined(OS_WIN)
   TriggeredProfileResetter* triggered_profile_resetter =
       TriggeredProfileResetterFactory::GetForBrowserContext(profile_);
   // TriggeredProfileResetter instance will be nullptr for incognito profiles.
   if (triggered_profile_resetter) {
     has_reset_trigger = triggered_profile_resetter->HasResetTrigger();
   }
 #endif  // defined(OS_WIN)
   return has_reset_trigger;
 }