Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/webdata/keyword_table.cc

 // Copyright (c) 2012 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/webdata/keyword_table.h"
 
 #include <set>
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
@@ skipping 370 matching lines @@
   // wasn't, we'll do it now.  Unfortunately a previous change deleted this for
   // some users, so we can't be sure this will succeed (so don't bail on error).
   meta_table_->DeleteKey("Default Search Provider Backup");
 
   if (!MigrateKeywordsTableForVersion45("keywords"))
     return false;
 
   // Migrate the keywords backup table as well.
   if (!MigrateKeywordsTableForVersion45("keywords_backup") ||
       !meta_table_->SetValue("Default Search Provider ID Backup Signature",
-                             ""))
+                             std::string()))
     return false;
 
   return transaction.Commit();
 }
 
 bool KeywordTable::MigrateToVersion47AddAlternateURLsColumn() {
   sql::Transaction transaction(db_);
 
   // Fill the |alternate_urls| column with empty strings, otherwise it breaks
   // code relying on GetTableContents that concatenates the strings from all
   // the columns.
   if (!transaction.Begin() ||
       !db_->Execute("ALTER TABLE keywords ADD COLUMN "
                     "alternate_urls VARCHAR DEFAULT ''"))
     return false;
 
   // Migrate the keywords backup table as well.
   if (!db_->Execute("ALTER TABLE keywords_backup ADD COLUMN "
                     "alternate_urls VARCHAR DEFAULT ''") ||
       !meta_table_->SetValue("Default Search Provider ID Backup Signature",
-                             ""))
+                             std::string()))
     return false;
 
   return transaction.Commit();
 }
 
 bool KeywordTable::MigrateToVersion48RemoveKeywordsBackup() {
   sql::Transaction transaction(db_);
   if (!transaction.Begin())
     return false;
 
@@ skipping 184 matching lines @@
     }
   }
 
   // Replace the old table with the new one.
   sql = "DROP TABLE " + name;
   if (!db_->Execute(sql.c_str()))
     return false;
   sql = "ALTER TABLE keywords_temp RENAME TO " + name;
   return db_->Execute(sql.c_str());
 }