1. Create and use the TopSites database file....

chrome/browser/history/top_sites_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 "app/sql/transaction.h"
 #include "base/string_util.h"
 #include "chrome/browser/diagnostics/sqlite_diagnostics.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/history/top_sites_database.h"
 
 namespace history {
 
 TopSitesDatabaseImpl::TopSitesDatabaseImpl() {
 }
 
 bool TopSitesDatabaseImpl::Init(const FilePath& db_name) {
   // Settings copied from ThumbnailDatabase.
   db_.set_error_delegate(GetErrorHandlerForThumbnailDb());
   db_.set_page_size(4096);
   db_.set_cache_size(64);
 
   if (!db_.Open(db_name)) {
     LOG(WARNING) << db_.GetErrorMessage();
-    return sql::INIT_FAILURE;
+    return false;
   }
 
   return InitThumbnailTable();
 }
 
 bool TopSitesDatabaseImpl::InitThumbnailTable() {
   if (!db_.DoesTableExist("thumbnails")) {
     if (!db_.Execute("CREATE TABLE thumbnails ("
                      "url LONGVARCHAR PRIMARY KEY,"
                      "url_rank INTEGER ,"
@@ skipping 205 matching lines @@
                              "DELETE FROM thumbnails WHERE url = ?"));
   if (!delete_statement)
     return false;
   delete_statement.BindString(0, url.url.spec());
   delete_statement.Run();
 
   return transaction.Commit();
 }
 
 }  // namespace history
-