[sql] WARN_UNUSED_RESULT on Execute().

chrome/browser/history/thumbnail_database.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 249 matching lines @@
   bool UpgradeToVersion5();
 
   // Migrates the icon mapping data from URL database to Thumbnail database.
   // Return whether the migration succeeds.
   bool MigrateIconMappingData(URLDatabase* url_db);
 
   // Creates the index over the favicon table. This will be called during
   // initialization after the table is created. This is a separate function
   // because it is used by SwapFaviconTables to create an index over the
   // newly-renamed favicons table (formerly the temporary table with no index).
-  void InitFaviconsIndex();
+  bool InitFaviconsIndex();
 
   // Creates the icon_map table, return true if the table already exists or was
   // successfully created.
   bool InitIconMappingTable(sql::Connection* db, bool is_temporary);
 
   // Creates the index over the icon_mapping table, This will be called during
   // initialization after the table is created. This is a separate function
   // because it is used by CommitTemporaryIconMappingTable to create an index
   // over the newly-renamed icon_mapping table (formerly the temporary table
   // with no index).
-  void InitIconMappingIndex();
+  bool InitIconMappingIndex();
 
   // Adds a mapping between the given page_url and icon_id; The mapping will be
   // added to temp_icon_mapping table if is_temporary is true.
   // Returns the new mapping id if the adding succeeds, otherwise 0 is returned.
   IconMappingID AddIconMapping(const GURL& page_url,
                                FaviconID icon_id,
                                bool is_temporary);
 
   // Returns True if the current database is latest.
   bool IsLatestVersion();
 
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   // This object is created and managed by the history backend. We maintain an
   // opaque pointer to the object for our use.
   // This can be NULL if there are no indexers registered to receive indexing
   // data from us.
   const HistoryPublisher* history_publisher_;
 
   // True if migration to TopSites has been done and the thumbnails
   // table should not be used.
   bool use_top_sites_;
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_