[sql] WARN_UNUSED_RESULT on Execute().

chrome/browser/history/shortcuts_database.cc

 // 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.
 
 #include "chrome/browser/history/shortcuts_database.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 150 matching lines @@
   db_.CommitTransaction();
   return success;
 }
 
 bool ShortcutsDatabase::DeleteShortcutsWithUrl(
     const std::string& shortcut_url_spec) {
   return DeleteShortcut("url", shortcut_url_spec, db_);
 }
 
 bool ShortcutsDatabase::DeleteAllShortcuts() {
-  sql::Statement s(db_.GetCachedStatement(SQL_FROM_HERE,
-      "DROP TABLE " kShortcutsDBName));
-  if (!s) {
-    NOTREACHED() << "Statement prepare failed";
+  if (!db_.Execute("DELETE FROM " kShortcutsDBName))
     return false;
-  }
 
-  if (!s.Run())
-    return false;
-  EnsureTable();
-  db_.Execute("VACUUM");
+  ignore_result(db_.Execute("VACUUM"));
   return true;
 }
 
 // Loads all of the shortcuts.
 bool ShortcutsDatabase::LoadShortcuts(
     std::map<std::string, shortcuts_provider::Shortcut>* shortcuts) {
   DCHECK(shortcuts);
   sql::Statement s(db_.GetCachedStatement(SQL_FROM_HERE,
       "SELECT id, text, url, contents, contents_class, "
       "description, description_class, last_access_time, number_of_hits "
@@ skipping 24 matching lines @@
                      "last_access_time INTEGER, "
                      "number_of_hits INTEGER)", kShortcutsDBName).c_str())) {
       NOTREACHED();
       return false;
     }
   }
   return true;
 }
 
 }  // namespace history