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

chrome/browser/history/thumbnail_database.cc

 // Copyright (c) 2009 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/thumbnail_database.h"
 
 #include <algorithm>
 #include <string>
 
 #include "app/sql/statement.h"
@@ skipping 105 matching lines @@
   db->set_exclusive_locking();
 
   if (!db->Open(db_name))
     return sql::INIT_FAILURE;
 
   return sql::INIT_OK;
 }
 
 bool ThumbnailDatabase::InitThumbnailTable() {
   if (!db_.DoesTableExist("thumbnails")) {
-    if (history::TopSites::IsEnabled()) {
-      use_top_sites_ = true;
-      return true;
-    }
-    if (!db_.Execute("CREATE TABLE thumbnails ("
-        "url_id INTEGER PRIMARY KEY,"
-        "boring_score DOUBLE DEFAULT 1.0,"
-        "good_clipping INTEGER DEFAULT 0,"
-        "at_top INTEGER DEFAULT 0,"
-        "last_updated INTEGER DEFAULT 0,"
-        "data BLOB)"))
-      return false;
+    use_top_sites_ = true;
   }
   return true;
 }
 
 bool ThumbnailDatabase::UpgradeToVersion3() {
   if (use_top_sites_) {
     meta_table_.SetVersionNumber(3);
     meta_table_.SetCompatibleVersionNumber(
         std::min(3, kCompatibleVersionNumber));
     return true;  // Not needed after migration to TopSites.
@@ skipping 395 matching lines @@
 
   InitFavIconsIndex();
 
   // Reopen the transaction.
   BeginTransaction();
   use_top_sites_ = true;
   return true;
 }
 
 }  // namespace history