Remove TopSites::IsEnabled() as well as related dead code.

chrome/browser/history/history_backend.cc

 // Copyright (c) 2010 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/history/history_backend.h"
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 565 matching lines @@
   if (db_->needs_version_17_migration()) {
     // See needs_version_17_migration() decl for more. In this case, we want
     // to erase all the text database files. This must be done after the text
     // database manager has been initialized, since it knows about all the
     // files it manages.
     text_database_->DeleteAll();
   }
 
   // Thumbnail database.
   thumbnail_db_.reset(new ThumbnailDatabase());
-  if (history::TopSites::IsEnabled() && !db_->GetNeedsThumbnailMigration()) {
+  if (!db_->GetNeedsThumbnailMigration()) {
     // No convertion needed - use new filename right away.
     thumbnail_name = GetFaviconsFileName();
   }
   if (thumbnail_db_->Init(thumbnail_name,
                           history_publisher_.get()) != sql::INIT_OK) {
     // Unlike the main database, we don't error out when the database is too
     // new because this error is much less severe. Generally, this shouldn't
     // happen since the thumbnail and main datbase versions should be in sync.
     // We'll just continue without thumbnails & favicons in this case or any
     // other error.
     LOG(WARNING) << "Could not initialize the thumbnail database.";
     thumbnail_db_.reset();
   }
 
-  if (history::TopSites::IsEnabled() && db_->GetNeedsThumbnailMigration()) {
+  if (db_->GetNeedsThumbnailMigration()) {
     VLOG(1) << "Starting TopSites migration";
     delegate_->StartTopSitesMigration();
   }
 
   // Archived database.
   if (db_->needs_version_17_migration()) {
     // See needs_version_17_migration() decl for more. In this case, we want
     // to delete the archived database and need to do so before we try to
     // open the file. We can ignore any error (maybe the file doesn't exist).
     file_util::Delete(archived_name, false);
@@ skipping 1572 matching lines @@
   return true;
 }
 
 BookmarkService* HistoryBackend::GetBookmarkService() {
   if (bookmark_service_)
     bookmark_service_->BlockTillLoaded();
   return bookmark_service_;
 }
 
 }  // namespace history