[sql] WARN_UNUSED_RESULT on Execute().

chrome/browser/history/url_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_URL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_URL_DATABASE_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "chrome/browser/history/history_types.h"
@@ skipping 234 matching lines @@
   // table creation functions so the in-memory database and the temporary tables
   // used when clearing history can populate the table and then create the
   // index, which is faster than the reverse.
   //
   // is_temporary is false when generating the "regular" URLs table. The expirer
   // sets this to true to generate the  temporary table, which will have a
   // different name but the same schema.
   bool CreateURLTable(bool is_temporary);
   // We have two tiers of indices for the URL table. The main tier is used by
   // all URL databases, and is an index over the URL itself.
-  void CreateMainURLIndex();
+  bool CreateMainURLIndex();
 
   // Ensures the keyword search terms table exists.
   bool InitKeywordSearchTermsTable();
 
   // Creates the indices used for keyword search terms.
-  void CreateKeywordSearchTermsIndices();
+  bool CreateKeywordSearchTermsIndices();
 
   // Deletes the keyword search terms table.
   bool DropKeywordSearchTermsTable();
 
   // Inserts the given URL row into the URLs table, using the regular table
   // if is_temporary is false, or the temporary URL table if is temporary is
   // true. The temporary table may only be used in between
   // CreateTemporaryURLTable() and CommitTemporaryURLTable().
   URLID AddURLInternal(const URLRow& info, bool is_temporary);
 
@@ skipping 20 matching lines @@
 // the macro if you want to put this in the middle of an otherwise constant
 // string, it will save time doing string appends. If you have to build a SQL
 // string dynamically anyway, use the constant, it will save space.
 #define HISTORY_URL_ROW_FIELDS \
     " urls.id, urls.url, urls.title, urls.visit_count, urls.typed_count, " \
     "urls.last_visit_time, urls.hidden "
 
 }  // history
 
 #endif  // CHROME_BROWSER_HISTORY_URL_DATABASE_H_