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

sql/statement.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 "sql/statement.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/sqlite/sqlite3.h"
@@ skipping 192 matching lines @@
 
 double Statement::ColumnDouble(int col) const {
   if (!CheckValid())
     return 0;
 
   return sqlite3_column_double(ref_->stmt(), col);
 }
 
 std::string Statement::ColumnString(int col) const {
   if (!CheckValid())
-    return "";
+    return std::string();
 
   const char* str = reinterpret_cast<const char*>(
       sqlite3_column_text(ref_->stmt(), col));
   int len = sqlite3_column_bytes(ref_->stmt(), col);
 
   std::string result;
   if (str && len > 0)
     result.assign(str, len);
   return result;
 }
@@ skipping 83 matching lines @@
 
 int Statement::CheckError(int err) {
   // Please don't add DCHECKs here, OnSqliteError() already has them.
   succeeded_ = (err == SQLITE_OK || err == SQLITE_ROW || err == SQLITE_DONE);
   if (!succeeded_ && ref_ && ref_->connection())
     return ref_->connection()->OnSqliteError(err, this);
   return err;
 }
 
 }  // namespace sql